A long time ago, some channel had a Beauty and the Geek marathon. I caught the first episode (of whatever season) while channel surfing, and watched the majority of that season until I fell asleep. I don't like reality television, but a lot of people do, and it's cheap to produce.
When I was much younger, I watched The Real World: San Francisco religiously. I then watched The Real World: London, Hawaii, and Road Rules season 1.