Choose your nerfed superpower:

Flight, but you can't get higher than two metres off the ground. Telekinesis, but your aim is always slightly off. Everything lands just short of you or flies slightly past you. Invisibility, but you can only be visible for a total of four hours per day. Extra set of limbs you have full control of, but they aren't human. Invulnerability, but you're also the clumsiest person in the world.