Jonah Hill Explains Mustaches on Sesame Street 3.87K Whitney Jefferson 08/18/10 05:00PM Filed to: Sesame Street Sesame Street Jonah Hill Elmo Mustaches TV Video This video provides a service to all of the little tykes wondering what the hair under their father's nose is. Jonah Hill and Elmo talk about mustaches and all of the neat-o things you can do with one, inside.