An old Halo 2 "technique" that allowed for insta-kills. BXR killed Halo 2 matchmaking.

What you'd do is literally hit the "B", "X", then "R" button combination quickly. (maybe all 3 buttons within milliseconds of each other)


http://www.wikihow.com/BXR-in-Halo-2
I played Halo 2 for an hour or 2 right before the servers went offline ... or were supposed to go offline. I was getting the piss BXR'ed outta me. I couldn't explain how I was dying so fast.