I don't think it's that unusual, but... Supernatural. I've watched it from the beginning, then abandoned it during season 3 due to life problems. Lots of years later, I marathoned season three-four-five in a month and then came season six and all my love just flew out of the window. I hated everything they did to the characters and that made me quite bitter (and all that fandom wank was disturbing), so I quitted. But then lately I've restarted the show and... this season is actually pretty good -for SPN standard- and I'm once again caring for the characters (bloody hell, when will the Winchester stop hurting?!). Now I'm craving more episodes because I've catched up and I want to know where they're headed!

Also, Buffy. I fell out of love with season seven, refused to rewatch the other seasons for long, long (sad) years, but then I saw an episode on TV and decided to rewatch it once again. I loved every single episode, this time. Ah, Buffy! <3