After this week's incredible Saved by the Bell reunion [1] on The Tonight Show, Mario Lopez shared a behind-the-scenes video of the big day on Extra. Along with some must-see footage of shirtless [2] Mario getting into that black leotard and practicing his dance moves, you can also watch him joke around with former costars Elizabeth Berkley and Dennis Haskins. Meanwhile, Jimmy Fallon [3] also appeared on Extra to talk about the reunion skit, and the pair couldn't stop gushing about how much fun they had together. Check out both videos for a fun, behind-the-scenes look at this week's reunion, then relive all the reasons why AC Slater is such a stud [4] in every sense of the word.