Why was the math book sad at the rapper?
Because it knew it couldn't count on his bars.
Sad Math Book
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Explain Bear
Listen here, buttercup. This joke is funny because it uses the word "count" in two different ways. The math book can't "count" on the rapper as in rely on him, but it also knows that the rapper's bars ain't worth a "count" in a mathematical sense. You probably still don't get it, but that's okay. You keep trying.