A bit like yesterday's question only about someone else's character. What has impressed you during a game?
I really have no idea. I have distinct memories of my old WEG Star Wars game that I used to run, and the pilot of the "Ballistic Wombat", Deeko Smiggins, was so good at piloting that they used to cruise past Star Destroyers and jink around whole squadrons of TIE Fighters who didn't stand a chance of hitting the ship. There were so many dice being rolled, that it sounded like thunder.
The same group's Call of Cthulhu game, I remember my character sticking their head into a tent while we were camping out on the moors, hunting a werewolf. It was after an evening of camping booze, and everyone was a little drunk, and the poor soul stuck their head into the tent and one of the characters (I think it may have been Milo again, Deeko Smiggins' player from Star Wars) threw a bottle at them to discourage being disturbed from a night's sleep. The roll was so good, the bottle instantly killed him... Ooops. I may be remembering it wrong (Milo will correct me), but that's what I remember anyway. It was a long, long, long time ago.
The lesson? Never throw anything at your team-mates. Especially weapons. Or fireballs.