There appear to be at least two Call of Duty: Modern Warfare 3 players in the world who have essentially leveled up 800 times each. Eight hundred times.
The Call of Duty games have something called Prestige Mode. It allows a player who has reached the higher online level in the game's multiplayer to give up their rank and start over. In exchange, in Modern Warfare 3, they're given access to something called the Prestige Shop and a bunch of new goodies.
You can Prestige over and over again. Each time you earn a new Prestige level. We've discovered two players (one with the help of friendly tipster The Dude) who have both Prestiged 10 times and have maxed out at level 80. That is officially insane. There may be more of them, but I haven't been able to track them down.
Here are their stats: