Not much of a competitive player as such, but there has been a few standout moments.

I think it must have been Halo 2 on a map called Midship - but could have been Halo 3 as well, cause they reused the map.

Anyway, my friend and I are playing 2v2 CTF on this kinda small map, that is also very vertical.
But basically you can see and shoot from one base to the other, but getting there and back was a bit tricky, meaning the enemies had plenty of opportunity to shoot you.

For some reason one match, we're just dominating.
We secure the victory by me running to the other base, while my friend lays down cover fire and distraction.
I get the flag, bee line straight for the air lift, that will take me to the scoring zone. But it also leaves me right out in the open the whole time.

But the other team is not cooperating or whatever, so I manage to smack both them dead with the flag, and score for the win.

It was one of those times, where you're just completely in the zone, and basically playing super reckless because you're high on adrenaline :-)