Well, I don't do much by way of multiplayer these days, but I can boast that I held the record for headshot distance on one particular Battle Grounds server. Given that Battle Grounds is a Half-Life mod set during the American Revolution (and not, say, a war between various types of coffee bean, though arguably a headshot in that would be even more impressive), a hit to the head at 600 feet, when hitting at all at half that distance is as much a matter of luck as anything else, would certainly be worthy of boasting about- except that I was on the receiving end. I stepped out of the spawn area, saw the puffs of smoke at the top of the fort (not just firing for effect, either; that smoke blocked line of sight), then died as the headshot notification popped up and everyone congratulated the shooter, who was as surprised as I was.
I do have another story, but I was again on the wrong side. Starsiege: Tribes had a very popular mod called "Shifter" that greatly expanded the available number of, well, pretty much everything. More suits, more weapons, more deployables, more vehicles, everything. One of those weapons was a tactical nuke launcher, that could only be mounted on the heaviest of suits (which had jets, but pretty much just for decoration), and was an indirect fire weapon that all but needed a targeting laser. For these reasons, almost no one ever used it. So one day, I'm following my usual strategy of slapping down a radar-blocking deployable and sniping at skiiers, when I spot one of the ultra-heavies stepping out of the front of his base and aiming with a heavy, indirect-fire weapon. Even my heaviest rifle, which only carried ten shots and had a volume level of "two simultaneous space shuttle liftoffs crashing into each other" couldn't kill him, but I could wound him something fierce. I take aim at his head and pull the trigger, but at the last second, my wrist twitches, and the shot goes awry. Downwards. To the gun in his hand. Tribes let you shoot the gun out of someone's hand, but before this I didn't think it was possible to do it as it was firing, to the point that the shell they just shot lands at their feet, impotently arcing toward nowhere.
This was also when I learned just how powerful the tactical nuke was. It went off, destroying him, a third of his team, and all their frontal defenses. My team promptly surged forward, and quickly won. I only stuck around because I didn't want to bail on them; the poor guy I disarmed was immediately banned for teamkilling. I headed over the clan's website and forum, wrote a post explaining what happened, and apologizing to the guy I'd accidentally gotten banned. The total elapsed time between the explosion and my posting what I wrote was less than ten minutes, but the guy (apparently a regular on both the forums and the server) had already written a lengthy screed roundly condemning me for what I'd done, and threatening me with some surprisingly creative forms of violence. They did reinstate him, but it must've been a truly terrible experience nonetheless.
