Do you have some racy images that would make someone blanch if they were to suddenly show up in the middle of a printout?
Maybe a few strange or obscene slogans you find awfully funny, but might just enrage someone with a chunk of oak up their butt? This prank is for you!
Print out the images and when nobody is looking, slide the images into the copier or the group printer or heck, someone's private printer. Just intersperse some images into their paper tray when nobody is looking and stand back and enjoy the fun.