"The Jimmy" Season 6, Episode 8

The gang's pal, Jimmy, refers to himself in the 3rd person all the time. He also wears a pair of specialty shoes that can make Jimmy jump high! George buys a shipment of the shoes in order to sell alongside Jimmy's knack for advertising. But when Jimmy falls due to a water spill made by Kramer who can't keep water in his mouth since visiting the dentist, George is left to do the pitch himself. Kramer, with his own pair of specialty shoes and drooling issue catches the eye of the head of an organization for the mentally challenged.