The Wilhelm Scream is a stock sound effect used in a great number of movies. Of course, reading about the sound, I didn’t know it off the top of my head.
But looking it up, I came across this video that shows clips of movies where the Wilhelm Scream has been used. As soon as I heard the first clip, I recognized it as the sound of the Storm Trooper falling down the shaft before the rope swing scene in Star Wars. Sure enough, that clip is in the video.
Not to be confused with James Blake’s eponymous track.