"Knock Knock" joke

A very attractive lady goes up to a bar in a quiet rural pub. She gestures alluringly to the bartender who comes over immediately. When he arrives, she seductively signals that he should bring his face closer to hers. When he does, she begins to gently caress his full more...

Knock Knock.
Who's there?
Banana.
Banana who?
Knock Knock.
Who's there?
Banana.
Banana who?
Knock Knock.
Who's there?
Banana.
Banana who?
Knock Knock.
Who's there?
Banana.
Banana who?
Knock Knock.
Who's more...

Knock knock?
Who's there?
Howie.
Howie who?
Howie gonna figure this out?

Person 1: Knock, Knock
Person 2: Who's there?
Person 1: Cows go.
Person 2: Cows go who?
Person 1: No, silly! Cows go moo!

Q: What's the worst trick you can do to your blind brother?
A: Leave the plunger in the toilet