Curb Your Enthusiasm

Larry David's HBO series is produced almost entirely without a written script. Actors receive an outline of each scene's events and emotional beats, then improvise the dialogue in character. The show's long run — twelve seasons and counting — demonstrates the viability of improvisation-driven production at the highest level of American television. The approach was influenced by David's work on Seinfeld and his deep familiarity with the stand-up and improv comedy community.