I was once playing MW2 with some friends on estate and I and another machine gunner where to provide covering fire to get the other team to stay away from the windows, well it worked, but I wasn't supposed to kill anyone on the other team,just get them away from the doors and windows so the rest of my team could go in, but I ended up getting a AC-130 using the simple tactic of firing randomly into the windows. needles to say, my team won.