Fay emerging from the bathroom with her guilty conscience on her sleeve:
Dad: Fay, did you wash your hands?
Fay: Yes
Dad: Why are you hiding your hands?
Fay: averting of the eyes
Dad: Let me smell your hands.
Fay: Holds up one thumb
Dad: Why did you lie to me?
Fay: I didn't lie!
Dad: Why won't you let me smell your hands
Fay: You can smell my thumb
Dad: Why can't I smell your hands?
Fay: Just a taste Dad, not the whole cake!