Gotta give credit to Road Rules, the first season with Mark and the Southern girl with the black hair (can't remember her name--Kitt maybe?).
After that, I became a reality tv junkie. I can get sucked into anything except the dating shows or AI.
But Survivor and TAR are the only ones that make my heart beat faster during the challenges. Since the middle of the first Survivor Season, I've pledged never to miss it.