Akuma's Kongou Kokuretsu Zan (d,d,d+PPP) from 3rd Strike.
I saw a person playing as Akuma against another player as Chun Li. They dude asked him to come and get him, as soon, as the other dude went for a jump kick. The guy who played as Akuma used the Kongou Kokuretsu Zan and killed him. The match only lasted 3 seconds.
PS: What is the english translation for "Kongou Kokuretsu Zan?" I know that "zan" means "slash."
Cable's Hyper Viper Beam from Mvs.C 2, yeah I know this move is cheap, but here is a story that places this super beyond cheap, more like insult to injury. This guy had all three of his guys (Strider, Jill, and Amingo) and he just needed one more hit to win. The other guy had only Cable and he just needed one more hit before he dies. Well, for a big finale, the dude went for a team super, however, when all three of his characters appeared on the screen, Cable took out his trusty (and I use the term loosely) Viper beam and killed all three opponents. The crazy thing was that each character on the other guy's team all had half energy, but still got killed. I knew the guy experienced the most humiliating defeat. He was then on referred as an "idiot." The guy who used Cable, blasted the already dead team with another Hyper Viper Beam. Arrrrrrrgh!
