Die, Hippy, Die (2005) 5

This episode was really funny. Cartman has his hippy radar out and is walking around South Park inspecting people's homes for hippies. He gathers them up, and locks them down in his basement, and throws a pile of joints down and a guitar to keep them happy. Meantime, he asks the Mayor for help getting rid of the hippies, because he noticed 3 drum circles growing by the rate of 2 hippies an hour. The mayor instead signs a permit for them to have a concert, and locks Cartman up in jail for going berzerk, and for kidnapping the hippies and putting them in his basement. Finally the town realize the hippies were destroying the town with their concert, and beg Cartman to help get rid of the hippies.