May 4th Marks Star Wars Day

PHILADELPHIA (CBS) – If you haven't realized yet, today is May 4th, or "Star Wars Day."

Fans of the films celebrate today because it sounds a lot like a line from Star Wars, "May the force be with you."

Oh, nothing to see here. Just some #Stromtroopers and #Vader riding the train. :) #StarWarsDay! #MayThe4thBeWithYou pic.twitter.com/OStj5hapNe

— PATCO (@RidePATCO) May 4, 2016

Experts think the saying dates back to a 1979 newspaper ad congratulating newly elected Prime Minister Margaret Thatcher.

It read, "May the fourth be with you Maggie. Congratulations."