If you had ONE wish...

[Avesu]

I would wish for the power to change probability!

What's the probability someone will find a cure for cancer, Ebola, etc? Well, its 100% with this power.

What's the probablilty that I win the lottery? Its 100% now.

 

[62cook]

To be a god in everything.

 

[GOFORGOLDCROZ]

I wish I could answer the oldest question in the universe.

 

[Xystz]

I would wish for the power to create ANYTHING that I can think of.

 

[Villager21]

I would really want to find my wood. It has been missing for over 24 minutes.
I'll settle for a spork.

 

[Mamiamato24]

I would wish to cure all incurable diseases, such as cancer.

Cancer isn't incurable, there just hasn't been a cure approved on a large scale.

 

[BiscuitCrisp]

I would want to be a fluffy house cat.

 

[Obiwankenobie999]

In-game: Huahwi to come back.
Irl: I would have loved to go to a Bob Marley concert.

 

[Ephiza]

I would wish for the ability to control matter. Essentially, I could make anyone, or anything, do anything I want it to

 

[R3vVolution]

I wish that I could visit far away places. Or places that humans can't reach, like Heaven, any time I want.