I'd have to go with the time my spec ops squad leader was gunning a falcon, and I was piloting. We got a roadhog medal and a guy shot a pair of locked rockets at us. The first I dodged and it sploded elsewhere, the second flew right at me, and I knew I was done for. Then I watched as the rocket went THROUGH the falcon, heard my squad leader screaming, rewatched it in theater, and the rocket had gone THROUGH his gutt and out the other side of the middle of the falcon...no detonation. We went on to gun down another 6-7 of their team before we got stuck by blueberries at near point blank range.
Allow me to ammend this~ my GREATEST moment I just realized was when my team was being spawn camped on spire by both our falcon and theirs AND the banshee. I climbed spire, jumped off, landed on the blades of oneof the falcons, walked up its back to the cockpit as I listened to the pilot screaming "A MAN JUST JUMPED ON MY ****ING ROOF~!! ****~!!! ****~!!!!!!!" He rolled the craft all over but I jacked his gunner out and turned the gun on that banshee, as the pilot of the craft whose gun I had just jacked lunged out midair and fell several hundred feet screaming random things in terror.