Knock-knock.

A race condition. Who is there?

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Knock Knock Jokes More Knock Knock Jokes

Why couldn't Susie ride the swings?

A: Because she has no arms! Knock knock. Who's there Not Susie!

What's your favorite tasteless 9-11 joke?

Here's mine. Knock knock. Who's there 911. 911 who You said you'd never forget