From Muppet Wiki

R is the 18th letter of the Roman alphabet. It first sponsored Sesame Street in Episode 0011.

Recurring sketches about R

• Alphabet Chat: R
• The R Machine (Ernie and Bert)
• Typewriter Guy: R - Rope
• The Letter of the Day:R
• Lefty the Salesman: "P and R"
• Harvey Kneeslapper tells the mailman that he has a letter for his mother... the letter R!

The Muppet Show

• In a running gag carried on through episode 115 of The Muppet Show, Fozzie claims to have a letter for Kermit the Frog. That letter turns out to be the letter R. Kermit tries to play the same joke on Scooter, who isn't so easily duped.

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