We’re not sure if this joke works internationally, since it’s based on a Norwegian children’s book ‘Karius and Baktus’. It’s a book that teaches kids dental hygiene by forcibly evicting two tooth-trolls from their tooth cavity homes. One of their catchphrases from the book is their scream of protest as the protagonist’s mother tells him to brush his teeth. («Don’t do as your mother tells you!») The joke here is that when it comes to liquid treasures of Islay, the tables have turned. As they melt, Karius and Baktus desperately wish that Andy would heed his mother’s advice regarding alcoholic beverages.