Couch killing a guy right before they couch killed me (or vice versa).
Same with couching someone or thrusting lance into a thrower or archer (killing them) right before they kill me with the projectile that's in the air.
And Frank that's happened to me on the map where there's the "sacrifice" pit, I was attempting to jump into it, someone shot and killed my horse mid-air, my guy stops in mid-air for about 1 full second, does the stand up animation from being knocked down, and then starts falling down again. It's one of the best things to see in game.