If I'm remembering "Cliffhanger" right, when Stan and Kyle were watching TV with Grandpa and the ad for Terrence and Phillip's movie "Not Without My Anus" came on, didn't the announcer say it would be airing in four weeks?
So it's not like we weren't forewarned. ::grin::
By the way (and if someone else has mentioned this I apologize but I haven't read all the posts yet) when T&P were watching American tv and were watching South Park, you could hear SP in the background while T&P were talking. And I swear I heard Cartman say, "... is my dad?" I wouldn't put it past Matt and Trey to have the mystery revealed that way... during Terrence and Phillip. :)
Just the idle ramblings of a sleep-deprived workaholic, Tirya