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The last of our office prankster items on the list, the micro sonic grenade packs a LOUD punch in a small form factor. At 110-115 decibels, you're talking about assaulting your victim's ear drums with something that's about as loud as a power saw! For the most bang-for-your-buck action, have your cell phone camcorder in-hand and quietly place the grenade near the office's infamous sleeping co-worker. Once the scenario plays out, upload to YouTube and watch additional laughs roll in!
Where to buy: ThinkGeek for $7.99 + S&H
[Related Gallery: 20 of the coolest gadgets and must-haves for your office: Part 2]