For some unknow reason, I was thinking about this yesterday on the drive home. Come up with superpowers, either from magic or mutation or technology or whatever, but they are an almost completely useless power.
For example:
Ability to predict the future, but you can only predict the price of a food item 24 hours in the future.
Ability to fly, but no higher than 5 mm over any solid surface.
Ability to read the thoughts of, and control an animal, but only worms (and they are not any smarter, so you only read worm thoughts and they only understand worm concepts).