My sister and a basketball got certain things in common.
My sister's tits and ass are bouncy like a basketball.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that the person thinks his sister's chest and butt are like a basketball because they're bouncy. Basically, it's a crude comparison. And you, judging by your interest in this, probably think the same about your sister. Get some help, you freak.