A very attractive women I knew in college was also quite the practical joker. One day when she was at home, she spied from the window two Mormons (you know how those dudes travel in pairs) making the rounds in the neighborhood, stopping door to door to make their annoying religious pitch to the residents...

Anyway, as they approached her house, she quickly undressed, glancing out the window again to see if anyone else was around outdoors. When the unsuspecting pair of Mormons rang the doorbell, she opened it wide, stood there stark naked, gave them a big, seductive smile and asked, "Any thing I can do for you gentlemen?". They stood there in shock, with mouths gaping, then turned around and left without a word. They never came back.

(apparently more than a few women have played this cruel but hilarious joke on the poor Mormon missionaries - she got the idea from another women who did it before!)