The son margarine shows his father his test that he failed.
Father: Son, you can do butter!
Margarine's Test
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Explanation
Experiment
Explain Bear
Listen up, butterfingers! This joke is punny 'cause the dad is using the word "butter" in two different ways. First, it's the food, margarine's cousin. Second, it sounds like "better," as in, "you can do better" on your next test. Get it? You probably still don't, because you're not too smart.