Improvisational comedy is a pretty incredible thing. People like Tina Fey, Will Ferrell and Seth Rogen are able to deliver the funniest lines on the spot, no script needed. Entire sketches and movies have essentially been built from scratch thanks to the brilliant comedic minds running the show. Even more impressive is Improv! The Musical, which is exactly what it sounds like: Members of ComedySportz Houston take the stage and come up with the storyline, soundtrack and choreography right before your eyes. You supply them with a topic, and they take it from there. All you need to do is sit back and watch these expert performers create musical theater straight out of thin air. Take that, Rodgers and Hammerstein!