Playing Shadowrun, 2nd or 3rd Edition:
The GM forced his DMPC into the group "cause someone has to make sure you wont get into problems". Apart from magic (but with his low essence of 0,0X hard to cast at), a hit-elf named "Seeker" was the most minmaxed+rulebent char i have ever seen in a Shadowrun game. He had everything deltaware, including a "Move-by-wire" system, grade 4, wich makes him VERY VERY VERY fast.
The catch: according to the rules book, the system could kill your char within months from constant seizures, but of course HIS system was the highest grade deltaware made for him, and free of everything negative.
Did i mention the char was also an arrogant prick constanty berating us for all the things he could do better: "Ups and I AM faster again, you loose", "oh i did more damage"...
Anyway, we play on, annoyed, but it was the only RP we had, then.
We get a new mission to get some execs daughter who crashlanded "in the wild" with her private plane. The group is supposed to get airdropped near the location by the questgiver.
We drop.. and its over "Bug City" Chicago, basically one of the deadliest areas in Shadowrun, full of insect spirits and basically walled off by the military.
The search was... annoying by "Seekers" "oh im just better" attitude, dragging out everything.
The group decided that "Seeker" will die in Bug City.
So, during a rest, my char sneaks about 250m away, "on recon", aims his sniper rifle at "Seekers" back who sits in the dark towards our campfire, and fires, so i think.
GM, liker allways, determines i should roll initiative, as "Seeker has seen him"... in the dark, a Ki-Adept made for stealth, 250m away... Of course, the victim to be fired at, has the higher initiative, turns around and shoots first, with his special handgun... into the sniper rifles barrel, jamming & destroying it... before i can shoot.
And berates me, to "not be such a shitty child"...
I left the group after that game, with 2 more players having enough of it too.
In the aftermath GM played on with the other players, and celebrates for an hour how "Seeker" then supposedly kills my character graphically, and the campaign goes on for a few sessions before it fizzles out.