Felix the Grouch

Felix the Grouch is an old friend who visits Oscar the Grouch in episode 3891 of Sesame Street. Oscar is disappointed to learn that his friend Felix has become a neat freak, and he worries that he isn't a real Grouch anymore. However they argue so much that Oscar realizes that Felix is just as grouchy as ever where at the end, Oscar and Felix have a big grouchy argument about Felix making clean spots onto Oscar's trash can which makes them both very glad to have arguments with each other.

The character of Felix is a spoof of the various incarnations of The Odd Couple, featuring two roommates -- the messy Oscar Madison (originated by Walter Matthau) and the neat Felix Unger (originated by Art Carney).