Lisa's Mudder Comes for a Visit

S5 E1: Lisa's mother surprises her and Whatshisname (Oliver) with a three week visit. She just became a countess--the title came with an estate she bought--but Eb tells everyone she's the Queen of Sicily. In her royal honor the locals hold a Ceremonial Day complete with a solid gold wooden key to the city. The highlight is a 21-gun-salute using just one cannon and three balls.