I have another one, as a player.
D&D campaign. The DM wanted it to be over-the-top power levels, gear, etc. Freedom to pick whatever races we wanted, etc. I went air genasi. Then we each got one wish. I assume because he wanted to try out his skill at fucking us over vs. ours at terming our wishes properly.
I wished to be able to fly. And the only loophole he found in my writeup was not mentioning the ability to land again. So my character was permanently hovering at least 6" off the ground.
Both of these things turned out to be his downfall. See, he wanted to TPK us. That was the ultimate goal. Let the party become insanely powerful... then try to TPK.
His first failed attempt was because of an airborne poison. Air genasi don't have to breathe. So everyone else is down, out, and me... "Uh. I don't breathe. It doesn't affect me."
Cue DM's sad puppy look as my character goes about and revives everyone.
The next instance was a ground-based attack. "Everyone takes..."
Me: "Uhm. I don't."
DM: "What, why?!"
Me: "Remember? She never touches the ground."
Not just sad puppy look that time, but the creeping realization that he did this to himself with the wish loophole.
So once again, everyone else is down and my character goes around to revive them.
That party eventually got to where they'd make sure I got the best gear. My character got turned into a vampire? They made it their mission to find her gear that'd let her walk in sunlight. She wasn't even the most martially strong or anything, but she always survived, so they made doubly sure of it.