Sorry, my 4y old brother wanted me to tell this joke here

Him: Knock, knock

Me: Who's there?

Him: Idiot

Me: Idiot who?

Him: IDIOT YOU!!

He probably doesn't understand downvotes so I will have no Karma left after this

EDIT: Wow! So many people upvoted this and I even got Silver! I'll tell my brother the Internet loved his joke!

EDIT: Thanks for the Gold, kind stranger