puckish: impish; whimsical; mischievous
Example: It happens that I had recently read an article on wordplay in the Smithsonian magazine in which the author asserted that some puckish soul had once sent a letter addressed, with playful ambiguity, to HILL JOHN MASS and it had gotten there after the postal authorities had worked out that it was to be read as "John Underhill, Andover, Mass." [Reference: Bill Bryson, I'm a Stranger Here Myself]
