Show: M*A*S*H (1972-1983)
Character: PA Announcer (Sal Viscuso, Todd Sussman)

Before Norm started cracking wise from his barstool on Cheers, an unseen voice was the king of the sitcom one-liner. Every episode of M*A*S*H featured a witty bit from the PA Announcer, often criticizing the food or informing the troops that the evening movie has been postponed yet again.

Though the PA Announcer was featured in every episode, he only broke the fourth wall once at the beginning of season four. You never saw the PA Announcer during M*A*S*H's decade long run, but both actors appeared as other characters during the run of the show.