Which celebrity Tweeter would make you jump up and down in excitement if they mentioned, RTed, and/or followed you?

@MrTeller or @pennjillette. I know that's two, but I just can't rationally pick between them. If I must pick one person, then I'd go with @StephenFry. (I disqualified people that I actually know from the running, which made it easier.)

Step right up...