Got a headshot through the gap of the roof of 2Fort's roof on Team Fortress 2 once. On a Soldier, I think.
... Shut up, I don't snipe much, okay? I've got a friend who's epic at sniping, I leave it to him while I jump around and draw attention.
Have a story to distract from my disgrace of snipers.
Best sniper kill I've personally seen was done by a friend on Left 4 Dead 2. Different friend, not the epic sniping one.
Not sure if it was a glitch, lag issue or maybe both, but he got a headshot on a Boomer and it didn't blow up. Even though it was a finale, we took the time to just shoot the body over and over again. Because c'mon, how often do you get to shoot intact Boomers repeatedly?
That's right, never.