I have had a lot of fun and crazy experiences, but I would have to say my favorite is when I was in a custom game, all the players were lined up perfectly next to each other on mongooses and one shot overkill, with the sniper. This happened as soon as the game began, literally like 2 seconds into the round and bam "round over."
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Once, my friend and I were doing a private match in halo 4 and only I knew where the scorpion was so I kept getting it and killing him. I feel sorry for him, and call a truce to show him where it re spawns at. I run into cover and get out a spartan laser. He comes rumbling around the corner in the scorpion and I begin charging my laser. I jump out from my cover. He screams. I shoot the laser at the tank. Boom.