I know Batman's Identity
If you entered the comic world and at a dinner party went up to Bruce Wayne and said I know you are Batman, what would happen? You don't demand anything or extort or anything like that, just simply let him know that you know.
If he acts like you are joking and then you provide him with everything you know, what would he do to you? Would he kidnap you later and interrogate you? Of course we wouldn't call his bluffs or threats because we know he ain't gonna carry them out.
Just something I was wondering... 🙂