Jimmy Kimmel has been doing this bit for 9 years now and it never gets old. Parents are supposed to tell their kids that they ate all of their Halloween candy, and their reactions are either hilarious or so sweet it'll melt your heart.
My favorite was the little boy that told his mom it was rude wude of her and she needed to eat vegetables vejabulls while his sister stomped a hole through her pumpkin bucket. I feel like he's going to grow up to be a politician.