Who Knew?

An unbelievably rude waiter at Oscar's Tavern in New York so unintentionally amused Muppet creator Jim Henson and Sesame Street director John Stone that he inspired the creation of Oscar the Grouch.

And he probably had no idea he was famous.... sort of.
 
The above tidbit is quoted from the book Who Knew? Things You Didn't Know About Things You Know Well by David Hoffman, page 156.