Oh yeah, it was on The Simpsons. In the episode he predicts the date for the Rapture, but it doesn't come through. He finds he made a mathematical error (there were 13 "people" at the Last Supper, not 12) and revises the date. Here is his first calculation:
October 21st is the new date (Homer was correct the second time around so watch out everyone).
Don't forget to void your bowels for Jesus on October 20th. It is disrespectful to have full bowels when Jesus comes back (actually it would be his first time on earth).
I still can't get over the fact that if man is made in God's image, that would mean that God has a butt, and it also means that God takes a dump once or twice a day.