All Star Trek shows
Seinfeld
ER
Third Watch
Seventh Heaven
Smallville
David Letterman
older sitcoms like Cosby Show, All in the Family, Brady's, and stuff like that. In my opinion, the sitcom died when Seinfeld produced its last episode. Frasier is descent though.
Sometimes, I'll sit down and watch an episode of Chips in the middle of the night.
Mostly, I'm a movie guy though.