Bill the Bubble Guy is a character from the TV show, Muppets Tonight. His very specific talent -- that he can make bubbles come out of his head -- is a regular running gag on the show He also appeared in the recurring segment "The Real World Muppets".
Bill first appeared in episode 102, in which the Head of the Network threatened to cancel "Muppets Tonight" and give Bill his own show unless guest star Garth Brooks performed a country song. Unfortunately for Bill, Garth closed the show with his hit, "We Shall Be Free."
In episode 205, Bill was one of the only Muppets to keep his identity when Ernst Stavros Grouper assigned new personalities to the show's characters; when Bill claimed that his name was Bob and that raisins came out of his ears, Mr. Grouper decided that his name would be Bill, instead, and that bubbles would come out of his head.