As an infiltrator, killed an NC MAX with the single worst pistol in the game. Pure luck.
Caught him unawares. He was anti-air, so he couldn't bring his full power to bear against me. I had the TX-1 Repeater, which is a very low damage pistol that fires three rounds rapidly. So if you can account for its horrid recoil, you might be able to hit a Galaxy (enormous gunship) right next to you.
He had his Aegis Shield up (blocks all frontal damage, but you cannot attack), and I shot him a few times in the arm. MAXes resist most bullet fire, but he didn't seem to realise that... uh, you can't fire without your shield down. He just walked slowly towards me, shield up, with me hopelessly plinking at his exposed right arm.
By the time he finally figured out how to lower his shield, I had plinked his armor and hull down to almost no health. He hit me with a few shots, leaving me on 0% armor and ~10% health - MAXes are designed to be able to take on pretty much any class and come out on top 1v1, but they're very expensive to use.
I hurriedly used the last of my cloak energy to reload the TX-1 Repeater, then fired all 21 remaining bullets into his arm after flanking him (cloaked, you're barely visible). He died. I won.
I was then killed a split second later, but damn if that didn't feel good.
Planetside 2, Briggs server.
Also: in Crusader Kings II:
The Aztecs, who formerly ruled over all of Iceland, Norway and Great Britain (except me) are facing massive, constant upheavals.
Their armies are horribly depleted, no longer the huge 150-250k doomstacks, now manageable sizes of around 30k-40k total, which is doable for me as Ireland with all of my demesne, levy and the three holy orders. I retook Ulster, fought off four peasant uprisings in Tyrone, then noted that the aztec's empire split in bloody half as England burst from its chest, coming back to life. England promptly realised I was making ground against the aztecs, arranged a marriage with my daughter Cthulette, then called me into their de jure wars. We stomped the Aztecs back up into Scotland, which was itself managing to take a few scant provinces back. Even Wales, which was long since dead, managed to free itself from the oppression of the Aztecs- well, some of it- the Duchy of Gwynedd broke apart from the Aztecs and joined in on the war, contributing about 450 soldiers.
It was glorious. Sadly, my Marshal with 23 Martial ability got captured and sacrificed.
Crusader Kings II - Sunset Invasion + Sword of Islam + Sons of Abraham + just about every DLC under the sun