I wish I had those bars like on the sims, I always seem to suddenly realise I've been starving for the last four hours!
I would fix the glitch that pyrex goes invisible in vegetable oil.
If I could stop time I would go up to someone and move my face really really close to theirs then start time for a split second then stop it again and disappear. It would freak them out! I would also do things like if there's a person wearing a hat on the train I'd move it to each person's head in the carriage so it would snap from head to head.
I can't think of a more fun super power. You could make stop motion in real life! It would be like this
http://www.youtube.com/watch?v=Fk9EBOOAYiU It's real, just camera tricks and editing.