Punk Buster.
The integrated program into any game that uses Punkbuster to catch cheaters or hackers that try to modify game content unfairly compared to other players.
Aimbots, Chamilion skins, Wall hacks, Name tag hacks, Custom Vectors, Commander hacks, Asus wall hacks, Crosshair, and many more.
"OMFG I HATE PB BECAUSE IM HACKING AND I JUST GOT BANNED!"