If you have ever played left 4 dead, you learn quickly to dread some of the sounds the infected tend to make , and just after a few hours you quickly learn what moan and groan goes to which infected, and you end up screaming BOOMER! SMOKER! TANK!
So what can make this better or worse? Well some have replaced those dreaded sounds with some often Hilarious ones, and still at times disturbing.
Macho Man zombies! credit to- JerryAtrick83
Bill Cosby infected! (listen for the zip zop zibby bop) credit to-wedunneedbadgers
Michael Jackson Infected soundpack Credit to-ImHellucard