granted, but Hitler is ruling the world still

I wish to have the money to travel the world and freedom to do so!!!

...Unfortunately "the world" is little more than a 900 square foot room with a subway turnstile in the middle. Here's fifty cents, just in case you want to check out the far wall.

I wish I could come up with an uncorruptable wish!

You suddenly know what that wish would be. However, you're out of wishes and the genie flips you off out of spite.

I wish, I wish, I wish I were a fish.

Fine, you're a fish. A finely filleted fish fresh from France. Prepared after being baked slowly for an hour.

I wish I had a swimming pool. A nice big one in my front yard. It wraps around my house, like a moat.

*poof!* there you go, one swimmable moat. with castle. set in 900 AD Britannia and an army of marauding Danes to give you a house warming.

I wish I was 18 again with all the knowledge and wisdom I have now. I'll even take the scars.

Okay, you keep you Knowledge(whatever) ranks, your Wisdom score, and your scar tissue. The rest of your stats become:

STR 8
DEX 9
CON 7
INT 7
CHA 5

You have no skill points to assign in other ranks.

I wish I could cast Fireball.

Sure you can cast fireball, it just centers on you every time.

Oh don't worry, you will be fine!
Your friends, though, not so fine . . . . .

commercial break:
I found an issue of the dragon magazine, number 49 that has an interesting article about wishes on page 63 called "Best Wishes!" by Gary Snyder

on an aside, those stat are pretty close to where my body is right now

My wish: I wish Gary Gygax's heart had not failed him so he would still be alive today.

*sob*

Wish granted. Gary Gygax is alive and he's enforcing copyright laws on all online derivatives of D&D, including this forum.

I wish I could open a brewery.

poof, you won a brewery! But congress has just reactivated the prohibition laws.

I wish for the secrets of Faster Then Light travel!!