Not my kid
What is one thing that you would know for sure your kid wouldn't do.
With my daughter I couldn't see her starting a fight. I could see her portecting herself and hurting someone in the process (she is so freaking strong, it's nuts) but not starting it.
With my son I would say I couldn't see him stealing. He's got a major issue with having a sense of justice so I can't see him stealing from anyone.
Name something that immediately makes you think "Not my kid!"