-The Scott Tenorman one. I watched this one on Netflix out of curiosity because it's so raved about and it's REALLY stupid and not funny at all.
-The "Butt Out" one. Anvilicious and idiotic pro-tobacco propaganda.
-The episode about a nuclear weapon in Hillary Clinton's vagina. Yeah, real mature and not at all sexist guys. 
-The episode that makes fun of Family Guy. It's bad enough to be this stupid, but making fun of a far superior show...
-The one that's full of celebrity references and substitutes "OMG SHOCK VALUE!" for actual jokes and humor.
That was one of the first that immediately came to mind (although I haven't watched it since 2006 or whenever it first aired). Totally sh**t episode.
Scott Tenorman was quite good though.
