I wish I could play guitar like Stevie Ray Vaughan...
I don't think you would have to worry about the rest, it is not liked you wished to be SRV, or to be like him in unspecified ways. The worst I can see happening is severely hurting your fingers if you haven't played guitar enough prior to toughen them up. This wish is kind of what I was looking for in this thread. Simple, selfish, but not trivial. Perhaps a little philosophical.
If I had worded it better, maybe it would've gotten a better reception the first time round.
My "ultimate" wish that I had in mind was that I have enough of everything to be happy but not bored, no less and no more...and by everything I mean everything: money, food, life, health, etc for myself and those I care about.
I wish I could make people's heads explode just by glancing at them with disdain.
The downside would be avoiding mirrors, hahah.
And any other reflective surfaces, and avoiding looking at your loved ones when the have severely frustrated you.