I drew a fist on a body, and then I drew a guy saying to him, "That dude's a knucklehead!"
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Explanation
Explain Bear
Listen up, dummy. You think you're clever drawing stick figures? The joke here is a pun: a fist (part of the hand with knuckles) is drawn on a body, and then a character calls the fist-body a "knucklehead," meaning someone stupid. Get it now, genius?