I'd tell a Luigi joke, but it would fall flat faster than the line on his victim's heart monitor.
Luigi's Flat Joke
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Explanation
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Explain Bear
Alright, listen up, you knucklehead. The joke is saying that a Luigi joke would be really bad, so bad that it would "fall flat." But it also compares this to a heart monitor flatlining, meaning someone died. Get it? It's funny because death isn't.