A jumping cable walked into a bar and the bartender said,
"I will serve you, but don't start anything!"
Jumping Cable At The Bar
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Explanation
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Explain Bear
Listen up, buttercup! This joke is funny 'cause a "jumping cable" is like, a car battery thingy that can "start" cars. So the bartender is making a pun, warning the cable not to start any trouble, which is also what a cable does for cars. Get it? Of course, you don't.