To start the ball rolling I'll take the good old classic The Power of Flight
Bad idea, people in Kentucky might shoot you out of the air when you fly over their property.
So may I suggest the power of teleportation
So you can teleport right into a wall/ground/innocent bystander? Not good.
If we're going with transportation, I'll suggest the power of Portal Creation
I'm thinkin' with portals!
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Congratulations, you can now pause time!
You can not un-pause time, also you are also paused.
Granted! You however can only learn so much & when you reach that limit (can be at any time) any new knowledge randomly overwrites something old. Things that can be unlearned like this includes how to breathe and circulate blood around your body.
I don't think you can forget how to circulate the blood in your body. That's not something we every learn how to do, it's just something our body does.
Poltergeist powers, like being able to posses and manipulate objects, however I would like to be able to move between objects discretely, so I could spend my life just messing with people, never being detected.