Why do comedians sometimes have to negotiate their punchlines like they're signing a treaty?
Because they want to avoid any "punch" lines that could lead to a diplomatic incident!
A knock-knock joke
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Knock, knock on the door of a parallel universe where the person inside is busy debating whether to answer the door or not.
"Who's there? I can't decide if I should let you in or not—I'm really torn between two realities!"
Short-lame-pun joke