Before I joined Love FiLM I used to buy an awful lot of DVRAB of shows I'd never seen, especially older series, to see what they were like. Some of these experiments worked out well, others not so much. As a result I'm lumbered with a few box sets I probably won't be rewatching, like season 1 of Cheers, and one or two that I wasn't able to make it all the way through (Blake's 7, Kolchak the series).
I also found it hard to resist cheap movies in HMV, so I end up with things like Donnie Darko and Memento that I didn't particularly like and have no real desire to watch again.
But I love most of my DVRAB, and will happily watch them over and over again to sustain myself during the increasingly long dry spells when there's nothing decent on the telly.