Me: Oh my God. You are so stupid!
Brother: I'm not stupid, I just ain't that clever.
Me:That makes you even more stupid for not knowing that you're stupid!
Me: And that makes you even more stupid for using 'ain't' when it's not a real word!
Brother: Shut up.
Me: That make you even more stupid for thinking I'll shut up!
Me: Oh my God, I am so annoying.
Brother: You just realised that now?
Me: That makes you even more stupid for thinking I just realised that when reality is I've known that since I was five!