The Wilhelm scream is a stock sound effect that has been used in many films and TV series, beginning in 1951 with the film Distant Drums. The scream is usually used when someone is shot, falls from a great height, or is thrown from an explosion. The sound is named after Private Wilhelm, a character in The Charge at Feather River, a 1953 Western in which the character gets shot in the thigh with an arrow. This was its first use following its inclusion in the Warner Bros. stock sound library, although The Charge at Feather River was the third film to use the effect. The scream is believed to be voiced by actor Sheb Wooley. It was featured in all of the original Star Wars films.
—Wikipedia: https://en.wikipedia.org/wiki/Wilhelm_scream
The Wilhelm Scream