Spaceballs Easter Egg - Wilhelm Scream

Go to the scene where Lone Star and Barf rescue the Princess and Dot Matrix from the jail. As they are escaping, they encounter four guards. When Barf runs out of ammo, He grabs the U-shaped tube from the wall and uses it to deflect the laser blasts back at the guards. When the fourth guard is hit, he will yell out a "Wilhelm Scream" For those of you that don't know, this scream is a stock sound effect used in dozens of movies since the 1950's. Also, this sound effect is used in all six Star Wars movies, which this film spoofs.