Several sketches were made for Sesame Street featuring the sets and characters from Happy Days. Henry Winkler appeared as Arthur "The Fonz" Fonzarelli and Ron Howard appeared as Richie Cunningham. According to Old School: Volume 2, the sketches began appearing on Sesame Street in Season 9 (1977).

Picture Title / EKA Description
1287-Fonz
A
Episode 1152
Fonzie talks about the letter A, which he pronounces as his trademarked "Aaaayyyy."
Noimage
Counting
Episode 1160
The Fonz counts from 1 to 10.
Fonzie-Body
Same as Yours
Episode 1169
Fonzie points out some parts of his anatomy such as his hands, and then tells the viewers that they are the same as the viewers' body parts.
Sesame Street Happy Days
C
Episode 1176
C for Richie Cunningham. Since Fonzie often referred to the patriarch of the Cunningham family as "Mr. C", Fonz explains the purpose of capitalization, or "C" representing "Cunningham."
The Fonz - W
W
Episode 1182
Fonzie walks out of the "Guys" room, addresses the audience, says "W", thinks of something, and walks back where he came from.
Fonz Richie Brush Teeth
Brushing Teeth
Episode 1185
Richie Cunningham sees Fonzie brushing his teeth, even though he hadn't eaten anything. Fonzie explains to Richie the importance of dental care, and then gives Richie a toothbrush of his own.
Fonz-OnOff3
On and Off
Episode 1281
In a three-part bit, Fonzie demonstrates "on" and "off" by hitting a jukebox (which plays "Exit").