A nun rushes onto a bus and confronts the bus-driver.

"Mr Bus-driver, I need your assistance as I've just been diagnosed with stage 4 Leukaemia. I only have till the end of the day to live and I do not want to die a virgin, but I do not want to desecrate my temple so it will have to be anal sex. Will you have anal sex with me?"

The bus driver ponders for a second and agrees.

"Before we start," interrupts the nun, "you need to promise me that you are not married and have children for that is a sin."

The bus-driver assures her that he is single, so after his shift he meets up with the nun and he starts shagging her.

Midway through he says, "I'm sorry sister, I am married, I lied."

"Don't worry, I'm going to a fancy dress, by the way my names Barry"