A robber robs a bank, gets all the money and is about to leave, but before that he asks a customer who’s lying on the floor, “Have you seen me rob this bank?”

A robber robs a bank, gets all the money and is about to leave, but before that he asks a customer who’s lying on the floor, “Have you seen me rob this bank?”
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“Yes, sir,” says the customer and gets promptly shot.
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“Have you seen me rob this bank?” the robber asks another customer.
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“Absolutely not, sir, but my wife here saw everything!”