In this brief article Elana Reiser describes her favorite lesson that combines popular culture with mathematics in a way that motivates student thinking and participation. Exploring open-ended problems, students may feel uneasy at first, but working in small groups often leads them to experiment with a variety of solutions. Reiser explains that under these circumstances, students always seem to generate creative mathematical ideas. This lesson focuses on an episode of "The Big Bang Theory" (season 2, episode 9) in which Raj, Howard, and Sheldon discuss Leonard's dating history as a geometric progression.