I have two Epic Win moments, which originated from a facepalm moment.
First, during a CtF game in Halo 2, neither my team nor the opposing team could comprehend the notion of strategy and repeatedly rushed in. My team unfortunately was significantly worse because they would use the most obvious routes (Zanzibar) and ignored my attempts to try and recommend a sneak in approach. Eventually in the final round, and their endless dying caused me to say: "Fuck it, I will do it myself." I crept in via the top level and dropped in on the two games guarding the Flag, shotguned them both, took the flag, raced out, beat the third game with the flag for a triple kill and finally launched the flag out, to shoot the fourth for another KO (no killtacular though), and home free in the warthog.
One of my teams than proceeded to brag about how much the other team sucked and how awesome we were, until I took him you all sucked and I did everything. Have to love people attempting to steal credit.
The other time was again in Halo 2, when come twelve year managed to kill me after I brought down a couple of his teammates. It proceeded to teabag me, climbing how awful I was at the game, and spewing all the cliche nonsense most of you are likely aware of. Of course he never did notice that upon dying, I had dropped a plasma grenade and his need to teabag me, meant he was right within the line of fire. Suddenly all I hear on my mic is: "NO FUCKING WAY!!!!!!!!!!!!!!!!!!!!"- mic cut. If I ever had a real life lmao, that was one of them. The kid was furious, screaming I was a hacker and chased me all over the map the entire game. I had roughly fifteen kills on him alone. He killed me I twice, if that.