A hippie gets onto a bus and proceeds to sit next to a nun in the front seat. The hippie looks over and asks if she would have sex with him. The nun is surprised by the question, but politely declines and gets off at the next stop.
The bus driver says to the hippie, "If you want, I can tell you how you can get that nun to have sex with you." The hippie of course says that he'd love to know.
So, the bus driver tells him that every Tuesday at around midnight, the nun goes to the cemetery to pray to the Lord. "If you go dress in a robe and some glowing powder," said the bus driver, "you can tell her you are God and command her to have sex with you."
The hippie decides to try this out. On Tuesday, he goes to the cemetery and waits for the nun. Right on schedule, the nun shows up. When she's in the middle of praying, the hippie walks out from hiding, in a glowing robe with a mask of god. "I am God, I have heard your prayers and I will answer them but you must have sex with me first."
The nun agrees and asks for anal sex so she might keep her virginity. The hippie agrees to this and quickly sets about to go to work on the nun.
After the Hippie finishes, he rips off his mask and shouts out, "Ha ha, I'm the hippie!!"
The nun replies by whipping off "her" mask and shouts, "Ha ha, I'm the bus driver!!!"