My fav episode is the one when Cartman gives Kyle AIDS. A lot of the Kyle vs. Cartman stuff is pretty intense sometimes actually.

I only own season 2 on DVD, which I got from a garage sale. I plan on getting seasons 1-6, and I'll see if I want anymore after that.

One of the very first episodes I saw was "Kenny Dies". At the time, I didn't know about the running gag of him dying every episode, so it was rather touching.

The most recent episode came pretty close to that ep, during the part when they play the song "Landslide" by Fleetwood Mac.

The rest of season 15 has been pretty anticlimactic.