diff --git a/entities/physicsentity.lua b/entities/physicsentity.lua
index f3c4de5..3934f39 100644
--- a/entities/physicsentity.lua
+++ b/entities/physicsentity.lua
@@ -63,7 +63,7 @@ PhysicsEntity = Class{
     end;
 
     -- Reimplement
-    wasHit = function(self)
+    wasHitBy = function(self, by)
     end;
 
 
diff --git a/entities/plane.lua b/entities/plane.lua
index ba95c19..8204156 100644
--- a/entities/plane.lua
+++ b/entities/plane.lua
@@ -180,7 +180,7 @@ Plane = Class{
         end
     end;
 
-    wasHit = function(self)
+    wasHitBy = function(self, by)
         local i = love.math.random(#CLANG_SFX)
         CLANG_SFX[i]:play()
     end;
diff --git a/entities/powerup.lua b/entities/powerup.lua
index 4291cfd..ec274c9 100644
--- a/entities/powerup.lua
+++ b/entities/powerup.lua
@@ -28,7 +28,7 @@ PowerUp = Class{
         -- Noop, implement in child
     end;
 
-    wasHit = function(self)
+    wasHitBy = function(self, by)
         HIT_SOUND:rewind()
         HIT_SOUND:play()
     end;
diff --git a/entities/tinyshot.lua b/entities/tinyshot.lua
index 8709e00..cb4adda 100644
--- a/entities/tinyshot.lua
+++ b/entities/tinyshot.lua
@@ -36,7 +36,7 @@ TinyShot = Class{
         end
     end;
 
-    wasHit = function(self)
+    wasHitBy = function(self, by)
         Animation(self.body:getX(), self.body:getY(), self.level, explosionFrames)
     end;
 
diff --git a/entities/vickers77.lua b/entities/vickers77.lua
index d5fae4b..78880e7 100644
--- a/entities/vickers77.lua
+++ b/entities/vickers77.lua
@@ -36,7 +36,7 @@ Vickers77 = Class{
         end
     end;
 
-    wasHit = function(self)
+    wasHitBy = function(self, by)
         Animation(self.body:getX(), self.body:getY(), self.level, explosionFrames)
     end;
 
diff --git a/level_state.lua b/level_state.lua
index 7e20d4e..5bb8a1e 100644
--- a/level_state.lua
+++ b/level_state.lua
@@ -177,18 +177,18 @@ function begin_contact(a, b, coll)
 
     if aObj ~= nil and bObj ~= nil then
         if aObj:isinstance(Plane) and bObj:isinstance(PowerUp) then
-	    bObj:wasHit()
+	    bObj:wasHitBy()
             bObj.deleteLater = true
             aObj:setPowerUpMode(bObj.mode)
             coll:setEnabled(false)
         elseif bObj:isinstance(Plane) and aObj:isinstance(PowerUp) then
-	    aObj:wasHit()
+	    aObj:wasHitBy()
             aObj.deleteLater = true
             bObj:setPowerUpMode(bObj.mode)
             coll:setEnabled(false)
         else
-            aObj:wasHit()
-            bObj:wasHit()
+            aObj:wasHitBy(bObj)
+            bObj:wasHitBy(aObj)
 
             local plane = nil
             local other = nil