Spitballs? Please! If you really want to annoy your coworkers, fire circus people over the cubicle wall!
Via: I Heart Chaos http://www.iheartchaos.com/post/1039378836/fun-japanese-thing-of-the-day-the-japanese
Available at: Thinkgeek http://www.thinkgeek.com/homeoffice/supplies/e5da/ ($10) Via: Cubicle Bot http://cubiclebot.com/office-supplies/floppy-disk-sticky-notes/
It may seem a little cruel to shut this poor little guy's tail in a book, but he doesn't mind. It's what he's there for.
Available at: Strapya World http://www.strapya-world.com/products/40380.html ($70)