Fans of Bill & Ted’s Excellent Adventure love the goofy jokes and sci-fi elements of the classic 80s movie. However, did you know that there’s a pretty major goof in the film? Here’s what you need to know about bootstrap paradoxes.
A ‘Bill & Ted’s Excellent Adventure’ character introduction creates a slip-up in the movies

Bill & Ted’s Excellent Adventure hit theaters in 1989, and viewers fell in love with the hilariously dim-witted Bill and Ted, played by Keanu Reeves and Alex Winter.
The movie follows Bill and Ted as they travel through time to gather a group of historical figures to help them ace a history presentation. The pair are given the time machine by the mysterious Rufus, who came from the future. According to him, Bill and Ted must pass their history class so that they can go on to create music that will inspire the world, leading to the utopian future Rufus has come from.
Rufus, played by comedian George Carlin, is a pretty major character in the movie, but some eagle-eyed fans noticed that there’s a bit of slip-up when it comes to his introduction.
In a Reddit post about the paradox, one user pointed out, “In Bill and Ted’s Excellent Adventure (1989), Rufus never introduces himself. His name is given to the present Bill and Ted by the future Bill and Ted creating a bootstrap paradox as the information has no traceable origin.”
In the movie, future versions of Bill and Ted appear alongside Rufus to brief present-day Bill and Ted on their time traveling journey. The future Bill and Ted are the ones that