What shows have you watched throughout your life that you simply can't stop watching over and over?
For me they would be:
Buffy the Vampire Slayer (I would watch this several times a year if I could)
Angel
Battlestar Galactica
Babylon 5
Stargate SG-1
Twilight Zone (I don't own any seasons, but every time there's a marathon, I simply cannot move or change the channel :P )
Family Guy