Tell stories of you being stupid when you were younger, your siblings being stupid, or random kids you saw being stupid
When I was like 6 or something I tried to have my cereal with juice because we were out of milk.
I wanted to be a supervillian when I grew up. My 'evil plan' was 'bring dinosaurs and dragons to life and train them to take over Earth and store them in a giant spaceship that flies between countries to take them over'
I also read a fact book for kids. I renember (rather vividley) that there was a fact in it saying women could grow beards, but it was rare (well there is a guiness world record for 'longest female beard' last time I read a guiness world record book so...). And you know that lil' bit of fluff everyone has in the dent between their nose and mouth? Well, I panicked because I thought since I had it it meant I would grow a mustache. Yeah, I was the stupidest little girl ever.
I thought infinite stupid stuff lol