When Call of Duty 4 first came out I bought it for the PC. It was pretty fun at first with the 64 players in a game, but I liked to play free for all matches often. There was one map called Shipment that was so small as soon as you spawned in your best bet is to just back up with a heavy machine gun and just head shoot all the spawners. I remember having 20 kill streaks from doing this. It was total chaos.