Wilhelm Scream.

[Mr.Sam]

A little bit of movie trivia here.

The Wilhelm scream is a stock sound effect first used in 1951 for the film Distant Drums. Actor-singer Sheb Wooley is considered to be the most likely voice actor for the scream, having appeared on a memo as a voice extra for the film.

The Wilhelm scream has been featured in many films and television programs since. Alongside a certain recording of the cry of the Red-tailed Hawk, the "Universal telephone ring", the Goofy holler, the Tarzan yell and "Castle thunder", it is probably one of the best-known cinematic sound clichés.

it's seen in a good number of films as a in-joke for sound producers, one of the latest productions using it is the sunday night project advert.

http://uk.youtube.com/watch?v=IpI68unEYMI
10 seconds in

if you go onto the wikipage you can see a long list of films that it is in and hear it on its own.

http://en.wikipedia.org/wiki/Wilhelm_scream

[Magnetez]

I always laugh when I hear it. Haha. George Lucas seems to love it.