The Wilhelm scream is a stock sound effect first used in 1951 for the movie Distant Drums. The scream was most likely vocalized by actor-singer Sheb Wooley, who later had a number one pop hit with the novelty song "Purple People Eater." It has been featured in dozens of movies since. Alongside a certain recording of the cry of the Red-tailed Hawk, the "Universal telephone ring" [1], the Goofy holler and "castle thunder," it is probably one of the most well-known cinematic sound clichés.

The Wilhelm's revival came from Star Wars series sound designer Ben Burtt, who tracked down the original recording (which he found as a studio reel labeled "Man being eaten by alligator"). The recording was actually from a film from 1951 titled Distant Drums. Although Distant Drums was the first known use of the sound, Burtt named it after "Pvt. Wilhelm", a minor character who emitted the same scream in the 1953 movie The Charge at Feather River. Its use in the Star Wars films was the beginning of something of an in-joke amongst some sound designers of the film industry, especially at Skywalker Sound, and Weddington Productions (now a division of Technicolor Sound Services). They continue to try to incorporate it into movies wherever feasible; action movies are naturals, but film sound cognoscenti are particularly impressed when it is used naturally in films such as A Star Is Born (with Judy Garland), The Wild Bunch and A Goofy Movie. In a tribute to its origins, the clip was used in the film Indiana Jones and the Temple of Doom when the villain Mola Ram was eaten by alligators. It was also used in Indiana Jones and the Last Crusade when an ambusher was killed during the attack on the German convoy.

what's an ogg file type?

oog is an opensource audio codec. Very much like a quicktime mov file.

(Vorbis is the codec, ogg is just a container, to be precise !)

winamp

Actually have no problem with winamp. I just have a habit of taking the joke one to far.
Just ask my dead exwife. I -told- her to duck!