Sexual attraction.
I'm not attracted to Brain. Not because he's a mouse or a cartoon, because those aren't deal-breakers for me. (As a kid I had a crush on Chip from "Chip 'n Dale's Rescue Rangers.) It's mostly his flat, mush, jowley face that works against him.
And yet despite that... I get a weird sexual jolt when he exclaims, "Yes!"
Someone tell me I'm not alone. <.<
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Whether they find life there or not, I think Jupiter should be considered an enemy planet.