The stuffty Superpower Game

[Menen]

The police can still find and arrest you

The ability to shoot steam out of my hands without burning myself

[Ad Bot]

[SWAT One]

But it occurs at an extremely high rate, and therefore your hands implode.

The power to become jolly green giant.

[ThinkInvisible]

You can become an Ent. The kind that can't walk; you're still jolly, though. ...and obviously green, and giant.

The ability to apply, at will, a physical force (e.g. pushing something, stomping on something) on any and all objects without an equal and opposite force against me.

[firestorm]

That's all you can do now. You never move nor think. You only, randomly affect the world. You have become one with the universe congratulations.
The ability to know what to do to get straight As

[Zanaran2]

You can only write the letter A, in a straight line.

The ability to projectile vomit at will.

[ResonKinetic]

You can only vomit your internal organs.

The ability to shrink your physical size.

[SWAT One]

But you can't regain size.

The ability to breathe fire like a dragon.

[ResonKinetic]

Your throat is affected by the flames.

The ability to grow wings and fly.

[firestorm]

Once you start, you can't stop, nor decrease altitude. Have fun in space.

[ResonKinetic]

Once you start, you can't stop, nor decrease altitude. Have fun in space.

You're missing something...

[Biohazard]

The United States

[ResonKinetic]

Canada

[Biohazard]

Canada

[ResonKinetic]

Canada

[ThinkInvisible]

Due to a hardware error, the forums become sentient. The previous posts, being completely off-topic and a breach in pattern, immediately draw its attention. It bestows upon their posters the ability to uncontrollably magnify the stufftiness of their own superpowers; then, promptly realizing it can't do this but it just did, the forums kills itself, becoming a normal non-living website again.

An ability that causes anything one convinces oneself/assumes is true to actually become true.