Another one from StrangeDeals.com. This could be fun. Looking to get back at a coworker? Sleeping brother or sister? The Sonic Grenade is your opportunity to turn any calm, serene environment into total calamity. Set the hard rubber grenade to one of three volume settings, pull the pin, and throw. 20 seconds later, sonic mayhem. The best price on the Sonic grenade is at ThinkGeek, where it's just $12.99. If you're spending more than $25, use coupon code PORTAL for $5 off. Shipping and taxes vary by location.