THX

THX is a sound system used for several movies. The noise was so loud that it caused the room to shake, someone’s glasses broke, somebody else’s teeth broke, the fire exit sign was smashed, the ceiling came crashing down, and a person's head exploded. When it was over, people were cheering, unlike Grandpa, who asked to turn it up.

Behind the Laughter
is a real company. The scene is often used in cinemas in America by THX.