Where Did The Expression “Elvis Has Left The Building” Originate?

The expression “Elvis has left the building” has been used as a comedic and colloquial way to say “the show’s over”, “get out while the gettin’s good”, “you don’t have to go home but you can’t stay here”, etc.

Simon Whistler of Today I Found Out explores the origin of this saying that’s more popular than Presley in this fun factoid video, getting to the bottom of this mystery.