Your sister is so stupid, when she saw Mountain Dew, she went to the top of a mountain to get it.
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Explanation
Explain Bear
Okay, listen up, buttercup. This joke is about how dumb your sister is. She thinks Mountain Dew actually comes from a mountain. Like, she's gotta climb up there and squeeze it out or somethin'. You probably think milk comes from a grocery store.
Anonymous
Yes that was good