Admitting My Little Brother's Secret

I always knew my little brother was sneaky. But I recently found out that he has a secret stash of comic books hidden under his bed. He claims they're too old and boring for him, but the way he acts when I bring them up suggests otherwise. It's not like I'm going to tell on him or anything, I just find it amusing how protective he gets over these comics. Do you have any siblings who surprise you with secrets?