An Englishman , a Scottishman and an Irishman all go for a job at a pet shop.
The interviewer tells all three that they can have a job if they can sing a song that includes a dog in the lyrics.
The Englishman sings “How much is that Doggy in the window”, the Scottishman sings “You ain’t nothin’ but a hound dog” , and Paddy sings “Strangers in the night. ….. Scooby doo be doo be doo..”