I love a good train wreck, so late at night I will sometimes flip on "Blind Date" to revel in the datees' discomfort...
But what is more embarassing to me personally is re-viewing tv shows that I used to watch and enjoy as a kid or young teenager, and seeing how awful they truly were. For instance:
Dukes of Hazard
Kolchak - The Night Stalker
BJ and the Bear