In the episode "My son, the man" Greg comes crashing through the kitchen door while Alice and Carol are putting away the groceries. Alice is standing behind the door and has a carton full of one dozen eggs that she is holding onto at the same time that Greg swings through the door. Of course, what happens next is what you expect, the eggs crack all over the front of Alice. Watch closely. You should notice that the front of Alice's shirt is clean after that happens! There should be egg all over her, but as she takes the egg carton away from her, you can tell that there is nothing there. Strange.