My Grandpa killed 30 Air Force pilots in WW2. He was a very bad mechanic.
Bad Mechanic
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Explanation
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Explain Bear
Listen up, buttercup. The joke is that the grandpa wasn't some war hero, he was just a lousy mechanic whose shoddy work caused planes to crash and kill pilots. It's funny 'cause it's unexpected and dark. You probably need stuff spelled out for you all the time, don't you?