diff --git a/dev-assets/doodads/box/box.js b/dev-assets/doodads/box/box.js
index 1c97439..30d3d6a 100644
--- a/dev-assets/doodads/box/box.js
+++ b/dev-assets/doodads/box/box.js
@@ -41,9 +41,6 @@ function main() {
     // When we receive power, we reset to our original position.
     var origPoint = Self.Position();
     Message.Subscribe("power", function (powered) {
-        console.error("Box received power! %+v", powered);
-        console.error("MoveTo: %+v", origPoint);
-        console.error("Keys: %+v", Object.keys(Self));
         Self.MoveTo(origPoint);
         Self.SetVelocity(Vector(0, 0));
     });
diff --git a/dev-assets/doodads/build.sh b/dev-assets/doodads/build.sh
index f434a94..5597a19 100755
--- a/dev-assets/doodads/build.sh
+++ b/dev-assets/doodads/build.sh
@@ -58,6 +58,10 @@ objects() {
 	cd box/
 	make
 	cd ..
+
+	cd crumbly-floor/
+	make
+	cd ..
 }
 
 onoff() {
diff --git a/dev-assets/doodads/objects/Makefile b/dev-assets/doodads/objects/Makefile
index 0573bc1..c56b8ed 100644
--- a/dev-assets/doodads/objects/Makefile
+++ b/dev-assets/doodads/objects/Makefile
@@ -2,10 +2,16 @@ ALL: build
 
 .PHONY: build
 build:
+	# Start Flag
+	doodad convert -t "Start Flag" start-flag.png start-flag.doodad
+
+	# Exit Flag
 	doodad convert -t "Exit Flag" exit-flag.png exit-flag.doodad
 	doodad install-script exit-flag.js exit-flag.doodad
 
-	doodad convert -t "Start Flag" start-flag.png start-flag.doodad
+	# Anvil
+	doodad convert -t "Anvil" anvil.png anvil.doodad
+	doodad install-script anvil.js anvil.doodad
 
 	for i in *.doodad; do\
 		doodad edit-doodad --tag "category=objects" $${i};\
diff --git a/dev-assets/doodads/objects/anvil.js b/dev-assets/doodads/objects/anvil.js
new file mode 100644
index 0000000..2359bca
--- /dev/null
+++ b/dev-assets/doodads/objects/anvil.js
@@ -0,0 +1,51 @@
+// Anvil
+var falling = false;
+
+function main() {
+    // Note: doodad is not "solid" but hurts if it falls on you.
+    Self.SetHitbox(0, 0, 48, 25);
+    Self.SetMobile(true);
+    Self.SetGravity(true);
+
+    // Monitor our Y position to tell if we've been falling.
+    var lastPoint = Self.Position();
+    setInterval(function () {
+        var nowAt = Self.Position();
+        if (nowAt.Y > lastPoint.Y) {
+            falling = true;
+        } else {
+            falling = false;
+        }
+        lastPoint = nowAt;
+    }, 100);
+
+    Events.OnCollide(function (e) {
+        if (!e.Settled) {
+            return;
+        }
+
+        // Were we falling?
+        if (falling) {
+            if (e.InHitbox) {
+                if (e.Actor.IsPlayer()) {
+                    // Fatal to the player.
+                    Sound.Play("crumbly-break.wav");
+                    FailLevel("Watch out for anvils!");
+                    return;
+                }
+                else if (e.Actor.IsMobile()) {
+                    // Destroy mobile doodads.
+                    Sound.Play("crumbly-break.wav");
+                    e.Actor.Destroy();
+                }
+            }
+        }
+    });
+
+    // When we receive power, we reset to our original position.
+    var origPoint = Self.Position();
+    Message.Subscribe("power", function (powered) {
+        Self.MoveTo(origPoint);
+        Self.SetVelocity(Vector(0, 0));
+    });
+}
diff --git a/dev-assets/doodads/objects/anvil.png b/dev-assets/doodads/objects/anvil.png
new file mode 100644
index 0000000..205becc
Binary files /dev/null and b/dev-assets/doodads/objects/anvil.png differ
diff --git a/dev-assets/doodads/switches/switch.js b/dev-assets/doodads/switches/switch.js
index 88e8eaf..973a7b3 100644
--- a/dev-assets/doodads/switches/switch.js
+++ b/dev-assets/doodads/switches/switch.js
@@ -7,13 +7,13 @@ function main() {
 	var state = false;
 	var collide = false;
 
-	Message.Subscribe("power", function(powered) {
+	Message.Subscribe("power", function (powered) {
 		state = powered;
 		showState(state);
 	});
 
-	Events.OnCollide(function(e) {
-		if (!e.Settled) {
+	Events.OnCollide(function (e) {
+		if (!e.Settled || !e.Actor.IsMobile()) {
 			return;
 		}
 
@@ -30,7 +30,7 @@ function main() {
 		}
 	});
 
-	Events.OnLeave(function(e) {
+	Events.OnLeave(function (e) {
 		collide = false;
 	});
 }
diff --git a/dev-assets/doodads/trapdoors/electric-trapdoor.js b/dev-assets/doodads/trapdoors/electric-trapdoor.js
index 2a33057..836f662 100644
--- a/dev-assets/doodads/trapdoors/electric-trapdoor.js
+++ b/dev-assets/doodads/trapdoors/electric-trapdoor.js
@@ -49,6 +49,11 @@ function setPoweredState(powered) {
         Self.PlayAnimation("open", function () {
             isOpen = true;
             animating = false;
+
+            // Had we lost power quickly?
+            if (!powerState) {
+                setPoweredState(false);
+            }
         });
     } else {
         animating = true;
diff --git a/docs/Doodad Scripts.md b/docs/Doodad Scripts.md
index 1a5271a..79cab8d 100644
--- a/docs/Doodad Scripts.md	
+++ b/docs/Doodad Scripts.md	
@@ -30,6 +30,7 @@ type API interface {
 
     // Game functions.k
     EndLevel()  // Exit the current level with a victory
+    FailLevel(message)
 
     /************************************
      * Event Handler Callback Functions *
diff --git a/pkg/play_scene.go b/pkg/play_scene.go
index 64ed4eb..2870a38 100644
--- a/pkg/play_scene.go
+++ b/pkg/play_scene.go
@@ -41,6 +41,7 @@ type PlayScene struct {
 	// buttons what to do next.
 	alertBox          *ui.Window
 	alertBoxLabel     *ui.Label
+	alertBoxValue     string
 	alertReplayButton *ui.Button // Replay level
 	alertEditButton   *ui.Button // Edit Level
 	alertNextButton   *ui.Button // Next Level
@@ -118,6 +119,29 @@ func (s *PlayScene) setupAsync(d *Doodle) error {
 		s.alertExitButton.Show()
 
 		// Show the alert box.
+		s.alertBox.Title = "Level Completed"
+		s.alertBoxValue = "Congratulations on clearing the level!"
+		s.alertBox.Show()
+	})
+	s.scripting.OnLevelFail(func(message string) {
+		d.Flash(message)
+
+		// Pause the simulation.
+		s.running = false
+
+		// Toggle the relevant buttons on.
+		if s.CanEdit {
+			s.alertEditButton.Show()
+		}
+		s.alertNextButton.Hide()
+
+		// Always-visible buttons.
+		s.alertReplayButton.Show()
+		s.alertExitButton.Show()
+
+		// Show the alert box.
+		s.alertBox.Title = "You've died!"
+		s.alertBoxValue = message
 		s.alertBox.Show()
 	})
 
@@ -310,8 +334,8 @@ func (s *PlayScene) SetupAlertbox() {
 		 ******************/
 
 		s.alertBoxLabel = ui.NewLabel(ui.Label{
-			Text: "Congratulations on clearing the level!",
-			Font: balance.LabelFont,
+			TextVariable: &s.alertBoxValue,
+			Font:         balance.LabelFont,
 		})
 		frame.Pack(s.alertBoxLabel, ui.Pack{
 			Side:  ui.N,
@@ -390,7 +414,7 @@ func (s *PlayScene) RestartLevel() {
 func (s *PlayScene) DieByFire(name string) {
 	log.Info("Watch out for %s!", name)
 	s.alertBox.Title = "You've died!"
-	s.alertBoxLabel.Text = fmt.Sprintf("Watch out for %s!", name)
+	s.alertBoxValue = fmt.Sprintf("Watch out for %s!", name)
 
 	s.alertReplayButton.Show()
 	if s.CanEdit {
diff --git a/pkg/scripting/pubsub.go b/pkg/scripting/pubsub.go
index 8324698..ae2a2fd 100644
--- a/pkg/scripting/pubsub.go
+++ b/pkg/scripting/pubsub.go
@@ -19,6 +19,8 @@ This adds the global methods `Message.Subscribe(name, func)` and
 `Message.Publish(name, args)` to the JavaScript VM's scope.
 */
 func RegisterPublishHooks(s *Supervisor, vm *VM) {
+	log.Error("RegisterPublishHooks called with %+v %+v", s, vm)
+
 	// Goroutine to watch the VM's inbound channel and invoke Subscribe handlers
 	// for any matching messages received.
 	go func() {
diff --git a/pkg/scripting/scripting.go b/pkg/scripting/scripting.go
index 90fa1b8..ab98a6d 100644
--- a/pkg/scripting/scripting.go
+++ b/pkg/scripting/scripting.go
@@ -17,6 +17,7 @@ type Supervisor struct {
 
 	// Global event handlers.
 	onLevelExit func()
+	onLevelFail func(message string)
 }
 
 // NewSupervisor creates a new JavaScript Supervior.
diff --git a/pkg/scripting/supervisor_events.go b/pkg/scripting/supervisor_events.go
index ca2a80a..12eacf9 100644
--- a/pkg/scripting/supervisor_events.go
+++ b/pkg/scripting/supervisor_events.go
@@ -10,14 +10,25 @@ Names registered:
 */
 func RegisterEventHooks(s *Supervisor, vm *VM) {
 	vm.Set("EndLevel", func() {
-		if s.onLevelExit == nil {
-			panic("JS EndLevel(): no OnLevelExit handler attached to script supervisor")
+		if s.onLevelFail == nil {
+			panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
 		}
 		s.onLevelExit()
 	})
+	vm.Set("FailLevel", func(message string) {
+		if s.onLevelFail == nil {
+			panic("JS FailLevel(): No OnLevelFail handler attached to script supervisor")
+		}
+		s.onLevelFail(message)
+	})
 }
 
 // OnLevelExit registers an event hook for when a Level Exit doodad is reached.
 func (s *Supervisor) OnLevelExit(handler func()) {
 	s.onLevelExit = handler
 }
+
+// OnLevelFail registers an event hook for level failures (doodads killing the player).
+func (s *Supervisor) OnLevelFail(handler func(string)) {
+	s.onLevelFail = handler
+}
diff --git a/pkg/uix/actor_collision.go b/pkg/uix/actor_collision.go
index e6a2acf..940acf9 100644
--- a/pkg/uix/actor_collision.go
+++ b/pkg/uix/actor_collision.go
@@ -207,6 +207,7 @@ func (w *Canvas) loopActorCollision() error {
 							// Are they on top?
 							aHitbox := collision.SizePlusHitbox(collision.GetBoundingRect(a), a.Hitbox())
 							if render.AbsInt(test.Y+test.H-aHitbox.Y) == 0 {
+								// log.Error("ActorCollision: onTop=true at Y=%s", test.Y)
 								onTop = true
 								onTopY = test.Y
 							}
@@ -217,6 +218,7 @@ func (w *Canvas) loopActorCollision() error {
 									lockY = lastGoodBox.Y
 								}
 								if onTop {
+									// log.Error("ActorCollision: setGrounded(true)", test.Y)
 									b.SetGrounded(true)
 								}
 							}