Shows ruined by the college years

Sister, Sister

There's a reason why "The Patty Duke Show" bowed out before high school graduation. The precociousness of identical twins can only last so long, so it's no surprise that the gimmick of long lost sibling sitcom "Sister, Sister" seriously overstayed its welcome. It would have been forgivable if Tia and Tamera's transition to college had been more subtle, but producers took it as an opportunity to completely rebrand the show. (Insert awkward attempt at hip-hop theme song here.)