[Alan Brady's Hair]

There were some critics that said when Shelley walks out the door, that's the end of Cheers," Glen said, adding that it was difficult to believe otherwise since "a main element of the show was the Sam-Diane courtship."

The thing is, Sam and Diane were a new phenomenon in sitcoms. No one knew that if you kept such a storyline running for seven or even ten years, the show would just turn into soap opera. It turned out to be a lucky break that she left before the story got tedious.