Ironically enough, my proudest moment on gaming wasn't actually on a platform.
A group of friends and I were playing a mod for D&D that used guns instead of swords and magic, and in a mission we were on (escaping from a collapsing oil rig while being chased by zombies), and the characters were in a bad strait, low on hit points and with a horde of ravenous freaks clawing at their heels while they ran for their lives. In a stroke of luck, we found a mounted machine gun, and I heroically opted to man it and buy the other PCs some time.
I need a 10 or more on a 20-sided dice to be able to hurt the zombies. With 20 shots, every time I managed to damage them, and in a single round managed to mow down a grand total of 18 zombies. The very next turn I rolled 3 natural 20s in a row. We actually stopped play to work out the odds, and the chances of it happening turned out be 1 in 16.777 BILLION.