5-year-old: Ninjas. Me: I didn't see them. 5-year-old: No one ever does. Checkmate.
He ate the dentist.
Because 7 ate 9
Checkmate!
Wrong, Batman always wins.   Yes, I do have the sense of humor of a 5 year old.
5-Year-Old: Empathy! I don't even know what it means! Me- I know how you feel.
He was feeling a little crummy.
You feeling salty bro