Why he's a brat: The costume says it all. Problem Child's Junior is a smart, supermischievous 7-year-old who does everything he can to torment his adoptive parents. He hijacks a car and ruins a little girl's birthday party, and even the nuns call him evil.
Why we still love him: It's clear that the little guy just needs a little love. Plus, his over-the-top antics are sort of hilarious, and we can't help but appreciate the clever tricks.