Finally the wait is over! Avengers: Endgame opens today in 4600 theaters across the U.S.! It's expected to make close to $300 million this weekend alone! Make sure you pee before the movie because it's 3 hours 58 seconds long! Tony Stark, Thor, Nick Fury and the gang sang their own special version of Billy Joel's "We Didn't Start the Fire" on the Tonight Show With Jimmy Fallon. Check it out!