I remember making a sound mod for Doom with Predator sound effects.
The imps made the Predator/crow noise... clack clack clack
When you picked up a gun it was Blain saying "payback time"
when you jumped or fell it was "get to the choppa!"
we replaced all the sounds... we thought it was pretty cool at the time... but we were young... and unless you were on a local BBS and had a modem you probably didn't see it