I second that.
If you had told me I would still be watching South Park in 2007 some nine years ago, I would have thought it impossible. It didn't seem like the show could have a long shelf life. But Matt and Trey have managed to change the show with the times and kept it current, relevant, clever, and entertaining.
The Simpsons, by comparison, were a pale shadow of their former self by seasons 10 and 11.