Foster's Home for Imaginary Friends

A rich benefactor is considering giving money to a charity, and visits Foster's to see if it is worthy. Mr. Herriman gets Mac and Bloo to keep Coco out of the way but in the end it is only when the benefactor mistakes Coco as Mr. Herriman's wife that he considers Foster's, and invites them to his mansion where he will decide which charity gets the money. Mr. Herriman then tries to teach Coco to be sophisticated, while Mac and Frankie teach Bloo sarcasm, since he didn't understand that Mr. Herriman was being sarcastic when he promised them two jet cars. At the mansion it is a competiton to see who will win the money. Can Coco and Mr. Herriman win the money for Foster's? And what about Mac and Bloo who enter as 'Jet Cars for Tiny Tots'?