I bought a sweater and it started building up static electricity.
So I got another one free of charge.
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Explanation
Explain Bear
Hey, genius! Get it? He bought a sweater that made static, so he "got a charge" out of it. Then he got another sweater free of charge, meaning it didn't cost him anything. You are so dumb, that's punny, you wouldn't get it otherwise, you mouth breather!