Only People Born Between 1978 And 1991 Will Recognize These 10 Sitcom Side Characters

One of the classic roles in '80s and '90s sitcoms was the side character who was basically in every episode, but wasn't really part of the "main" cast. Usually, this was a neighbor, a best friend, or a nemesis. Sometimes it was a robot or a cat. Anyway, you're ONLY go...