Girl At Party: Dude, you can't just start a slow clap at any time and expect everyone to join in. You have to wait for the right moment.
Guy At Party: Oh, okay... But h-how will I know when its the right moment?
Girl At Party: Oh don't worry, you'll know.
The first recorded instance of the slow clap is right after Jesus brought Lazarus back from the dead. Saint Peter just thought it was the most appropriate thing to do.
Randy: That's the slow clap. You're getting the slow clap!