Wilhelm scream

The Wilhelm scream is a stock sound effect, first used in the 1951 movie Distant Drums. It has since been used in Star Wars, Indiana Jones, Disney cartoons, and many other movies, TV shows, and video games.

The original use was for a character getting bit by an alligator, and dragged underwater. The third movie to use this sound effect was The Charge at Feather River, where a character named Wilhelm gets shot in his leg with an arrow - this is where the name comes from.

Today, the sound is still used very often, and serves as an in-joke among movie lovers and creators. If you haven't noticed it before, I promise you will now! :P