When excitement takes over speech facilities and results in reciting really long lists.
Did you see Howard Dean at concession speech? He really suffered the Dean effect.

Kevin Garnett really suffered from the Dean effect after winning the NBA finals.
by skotye June 18, 2008
Get the the Dean effect mug.
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
Get the James Dean Effect mug.