The perfect gadget for office or dorm room warfare, the sonic grenade is a realistic styled grenade that blasts earsplitting sounds that will drive anyone absolutely mad.
It is constructed of hard rubber and plastic, making it pretty easy and safe to toss. All you have to do is set the grenade to one of three volume settings, pull the pin, and throw.
Once the alarm goes off, your prey will only be able to adjust the settings, they will not be able to permanently turn the unit off.
Even the poorest of college students can afford to torture their hung-over neighbors for only $11.