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When people want to be friends with you (or date you) more, because you're a loner/rebel/mysterious personality type. Almost all are attractive, yet rough around the edges & many times emotionally unavailable.

(Edward from Twilight shouldn't count -he sparkles in the sunlight.)
James Dean Effect :

Stupid person: "Wow, he/she is so mysterious & misunderstood. I want him/her to love/like me. I'm sure I can change them, maybe if I change myself they'll like me."

Logical person in response to emotional persons statement : "It's just the James Dean Effect, you want them more because you probably can't have them in your life. Ever."
by ShoveOff December 14, 2010
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