In the 20+ years that the Simpsons have been on the air, they have done countless parodies of other TV shows, movies, celebrities, news situations, and so one. However, its rare that they’ll actually spoof another cartoon! Few honors have taken place over the years, including The Critic, The Flintstones, and Family Guy. In a recent episode, The Simpsons did a take on one of the other most popular and long-lasting animated series on TV today, South Park, with Bart, Milhouse, Ralph, and Nelson standing in for Kenny, Kyle, Stan, and Cartman. Take a look at the clip in action below to see TV animation history!