The taxi driver picks up a nun. After a little while, he turns and says to the nun, “Sister, I've always wondered what it would be like to get a blowjob from a nun.” The nun smiles and says, “Well, perhaps I can grant your wish if you are Catholic and go to church.” The cabbie says, “Yes, I am Catholic and, yes, I go to church.” So, he pulls over and the nun gives him the best blowjob he ever had.
They get back on the road and, as he's about to drop the nun off, the cab driver says, “Sister, I have a confession. I'm not Catholic. I'm Jewish, and I don't go to church.”
The nun says, “I, too, have a confession. My name is Dave and I'm going to a costume party.”