If you're ever in need of a punching bag, just go to your local Alzheimer's unit.
They'll forget you were there in like three minutes.
Punching Bag Suggestion
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Explain Bear
Listen up, you big dummy! This joke is based on the sad fact that people with Alzheimer's have memory problems. The joke says you can use them as a punching bag (which is super mean, by the way) because they'll forget you hit them right away. Get it? They forget stuff because their brain is broken. It's dark humor, you simpleton.