It's a grave mistake to talk badly about the death.
Grave Mistake
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Explanation
Experiment
Explain Bear
Hey, listen up, buttercup. This "joke" is all about a pun. See, "grave mistake" sounds like a serious error, but "grave" also means where dead folks chill. So, talking smack about death is a "grave mistake" in both ways. Get it? I bet not, since you think ketchup is a vegetable.