<P> Bert and Ernie are two Muppets who appear together in numerous skits on the popular U.S. children's television show Sesame Street . Originated by Frank Oz and Jim Henson, the characters are currently performed by Muppeteers Eric Jacobson and Peter Linz; Oz occasionally performed Bert between 2000 and 2006 . </P> <P> Bert and Ernie were built by Don Sahlin from a simple design scribbled by Jim Henson, creator of The Muppets . Initially, Henson performed Bert and Oz performed Ernie, but after just one day of rehearsal, they switched characters . The original idea was to show that even though two people can have totally different characteristics, they can still be good friends . According to writer Jon Stone, the relationship between Bert and Ernie reflected the real - life friendship between Henson and Oz . </P> <P> According to A&E's Biography, Bert and Ernie were virtually the only Muppets to appear in the Sesame Street pilot episode, which was screen tested to a number of families in July 1969 . Their brief appearance was the only part of the pilot that tested well, so it was decided that not only should Muppet characters be the "stars" of the show, but would also interact with the human characters, something that was not done in the pilot . </P> <P> An ordinary Bert and Ernie skit involves Ernie coming up with a hare - brained idea, and Bert trying to talk him out of it, ending with Bert losing his temper and Ernie remaining unaware of the results of his own bad idea . For example, in one sketch, Ernie tells Bert he started to collect ice cubes the day before, and put them under the electric blanket overnight . When he shows the ice cubes to Bert, he finds out that they have melted into water . Bert knows what happened, and tries to tell Ernie that his ice cubes melted because of the electric blanket, but Ernie takes this to mean that a fish from the ocean came into the apartment and melted his ice cubes, and vows to find the (non-existent) fish that melted them . </P>

When did bert and ernie first appear on sesame street