What would you Wish for if you wanted to make your DM cry?

[Tyndmyr]

The dm thought about it for a moment and raised his forehead vein. NO. Guess he didn't see that coming.

I never tell players "No, you can't wish for that". I grin evilly and say "Sure, you can wish for that".

It's so much more fun to see the look of uncertainty and terror on their faces.