Tired of being a kid, Timmy wishes he could be older in order to go adult things, but his wish backfires when "Da Rules" states that now that he is an adult, Cosmo and Wanda can't grant him any wishes or turn him back into a kid until he is a kid or acts like a kid.

When Timmy breaks his dad's sentimental, grade school trophy and gets punished, he wishes himself back in time to stop his dad (as a kid) from ever winning the dumb thing in the first place.