Three Irishman, who all stuttered, decided to try a new speech therapist. The therapist turned out to be the most beautiful woman they had ever seen. She also had a new technique for curing the stutters.

She tells the three, "If you can say the name of the city where you where born without stuttering, you can have sex with me."

Francis goes first and says "D-d-dub-b-blin". "Sorry", says the therapist.

Sean goes next and says "B-b-belfast". "Sorry", says the therapist.

Finally, Paddy manages to get out "London", at which point the therapist takes him into the back room, where they have the best sex that Paddy ever had. As Paddy is lying there catching his breath, the therapist asks him "Well?" at which point Paddy says "D-d-derry"