Cool new prank idea: print a bunch of pictures of butts to a random printer. Seriously, you can do it -- Google has indexed somewhere around 86,800 publicly available HP printers. But the results are truncated, so you actually only get 73 rather than thousands and thousands.
A little savvy searching shows that you can hit up any of the devices listed by clicking any of the links in the results. Surprise a library in Seattle with several pages of Notorious B.I.G. lyrics. Send the University of Cambridge a hard copy of a Rihanna cover. (We actually did this, and it worked). Congrats, random Chinese IP address, you just got bombed with a 50 copies of a report I once did on War and Peace. You should probably make your printer private if it isn't already. [Google via Port3000]
Picture: Shutterstock/Marynchenko Oleksandr