You know the old "If you could have one superpower, what would you pick?" game? I like to play it as "If you had a superpower but could only use it for one specific thing, what would it be?"
Although I'm tempted to pick stopping time so I can sleep longer, I'm ultimately going to go with telekinesis so that I can put cigarettes discarded from car windows back in the car. That'd teach 'em a lesson they wouldn't soon forget. I'd be the Ashtray Avenger. You?