A hippie gets onto a bus and proceeds to sit next to a very beautiful Nun in the front seat. The Hippie looks over and asks the Nun if she would have sex with him. The Nun, surprised by the question, politely declines and gets off at the next stop. When the bus starts on its way 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 evening at midnight the nun goes to the cemetery to pray to the Lord. "If you went dressed in robes and some glowing powder", said the bus driver guy, "you could tell her you were God and command her to have sex with you."
Well the Hippie decides to try this out, so on Tuesday he goes to the cemetery and waits for the nun, and right on schedule the nun shows up. When she's in the middle of praying, the hippie walks out from hiding, wearing glowing robes and a mask. "I am God," he intoned. "I have heard your prayers and I will answer them, but you must have sex with me first."
The nun agrees but 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 robe and shouts out, "Ha ha, I'm the hippie!!"
The nun replied by whipping off a wig and habit, shouting, "Ha ha, I'm the bus driver!!"