The Hippie and the Nun.
One day, a nun is sitting on a bus. A hippie saunters over and says "Hey lady, wanna have sex with me?" The nun politely declines and gets off the bus on the next stop.
The bus driver, who overheard this conversation, stopped to talk to the hippie before he got off.
"Ya know, that nun goes to the cemetery every Sunday night to pray at the graves of her parents. I bet if you dressed in robes, put on some glowing powder, and claimed you're God, that nun will do whatever you want her to."
So that Sunday, the hippie does exactly this and finds the nun at the cemetery.
"NUN, I AM GOD, YOU MUST DO MY BIDDING. YOU MUST HAVE SEX WITH ME RIGHT NOW."
Immediately, the nun agrees but says "Of course, my Lord. But please, may it be anal? I wish to preserve my virginity."
The hippie reluctantly agrees and the two have anal sex. After they are done, the hippie rips off his mask and shouts "HAHA. IM THE HIPPIE."
The nun then rips off her mask and says "HAHA. IM THE BUS DRIVER."