Will Smith was only 21-years-old when The Fresh Prince of Bel-Air premiered on NBC in September of 1990. Although he was already a successful rapper, the show was a very big deal. After all, the entire premise revolved around him, and the character was even named Will Smith. The show was going to either succeed or fail largely based on his performance, and that had to be a lot of pressure for him. For as goofy as his alter ego was on the show, Smith clearly took the show very seriously. After all, it couldn’t have been easy to learn the lines of all the characters on a show with a pretty sizable ensemble. Still, if he was visibly mouthing the lines of the other actors, it’s understandable that he doesn’t want to rewatch all these years later.