Can Peter make tu act childish?

I'm asking this because during gym today, I was being really silly and childish, and so was my other friend. But I was the silliest and it seemed like I couldn't control it. I have never really been like this before. I've been childish before o have acted silly but nothing like this. But it was SO MUCH FUN! XD. Right now I want to run around my room, o just jump around XD