Phineas and Ferb turn the city of Danville into a giant thank you card for Santa Claus because they feel nobody ever thanks him for all the joy he brings to the world. Doofenshmirtz uses a device called the "Naughty-inator" to put the city of Danville on Santa's naughty list.
G
(All ages admitted. There is no content that would be objectionable to most parents. This is one of only two ratings dating back to 1968 that still exists today.)