It's Halloween, and you're trick-or-treating with your four-year-old daughter, Emma. You walk up to a house where the door stands wide open, spooky music blasting from indoors. Just inside the door, a spotlight shines on a cauldron of candy.

You're fairly certain something's going to happen, but Emma begs and pleads to go up, so you go with her. Just as she steps inside the door, Aubrey jumps out from the shadows, dressed like a sea hag.

"Boo!"

Emma screams, and tries to run to you, but her stubby little legs get tangled and she falls over.