Cool new prank idea: print a bunch of pictures of arses to a random printer. Seriously, you can do it—Google has indexed somewhere around 86,800 publicly available HP printers.
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 fifty copies of a report I once did on War and Peace. [Google via Port3000]
Image credit: Shutterstock/Marynchenko Oleksandr