South Park Episode 15.03 Royal Pudding

Mr. Mackey is making the kindergarten students perform a play about tooth decay and the importance of dental hygiene, and is furious when Ike, who is supposed to portray tooth decay, misses a rehearsal to watch the Canadian royal wedding. During the ceremony, the princess is enclosed in an isometric cube and spirited away. Ike is so distraught that he cannot stop crying during rehearsal and gets sent home by Mr. Mackey. As people all over Canada commit suicide out of despair for the princess' abduction, the Prime Minister of Canada instructs all people of Canadian descent to go home and open their "Box of Faith", which contains - along with a location beacon, first aid kit, and sandwich - a video recording issuing a call to arms for all Canadians in fighting condition to meet "by the tree in Edmonton". Ike answers the call and, while riding a bus to Canada, meets a fellow Canadian named Ugly Bob, who claims he has to wear a bag over his head because, while his simply looks Canadian to Americans, other Canadians find his face frighteningly ugly.