In the Name of the Grandfather
The Simpsons: Season 20, Episode 14
The Simpsons head to Ireland to visit Grampa's favourite pub, but the old haunt isn't exactly thriving and after a Guinness or two, Homer and Grampa decide to buy the struggling business.
Show: The Simpsons
Season number: 20
Director: Ralph Sosa
Air date: March 22, 2009
Episode number: 14
Chalkboard gag: "Four leaf clovers are not mutant freaks"