Why is Jenna Marbles so funny? She lost all her marbles.
Lost Marbles
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Explanation
Explain Bear
Alright, listen up, buttercup. The joke is that Jenna Marbles is funny because she "lost her marbles," which is a saying that means someone is crazy or not all there. It's a pun, see? You probably need subtitles even when you're watching TV, don't you?