Grouchology

 Earliest Known Appearance: Episode 4260 " Grouch ology  " is a course taught at Putrid University  ( P . U . ) as shown in Sesame Street  episode 4260.

The course is taught by Professor Nikola Messla ( played by  Jason Jones  ) & the  Pesties  ( performed by  Joey Mazzarino ,  Leslie Carrara - Rudolph  &  Matt Vogel  ) about the goals of the Grouch ology  online school.

OSCAR THE GROUCH takes this online Grouch ology class from the  college , learning how to be a  Grouch  scientist. Messla instructs  Oscar  at  his   trash can , via webcam , helped by the  Pesties.

TV / Movies / Specials

 * Sesame Street ( 1969 - present )


 * Episode 4260 ( 2011 )