Mr. Callahan
From Muppet Wiki
Mr. Callahan appeared in several UK skits on Muppets Tonight featuring Polly Lobster and Clueless Morgan. The skits were seen from Mr. Callahan's point of view. The audience would see Mr. Callahan's furry hands pushing open the doors to a diner, and then enter with him. Polly and Clueless, apparently working at the diner, were very deferential to Mr. Callahan, who never spoke.
In one segment, Mr. Callahan enters the bar as Polly sings "If ya want my body and ya think I'm sexy ..." then perks up and notices a change in Callahan's appearance. Then he calls Clueless over to the scene, where he makes a few wisecracks about himself and his life. Polly, annoyed with Clueless's jokes, tells him to sing a song, which is interrupted. All of the segments followed a similar format.
The segments are a reference to the Joe the Bartender scenes from The Jackie Gleason Show, in which Gleason and a character named Crazy Guggenheim would chat with whoever was around and then sing a song. Guggenheim, a drunk, would sing in a beautiful melodic voice that contrasted with his personality.
