Sonic Alarm Grenade: Ear Shrapnel

You know your sibling or neighbor is going to piss you off one night while you're trying to get some sleep. No reason to let them off easy now that the Sonic Alarm grenade is out. Complete with 3 separate noise levels, all you do is grab the grenade, pull the pin, and throw. 20 seconds later, anyone near the device will start to cry and squirm around on the floor due to it's ultra-high noise making capabilities. Goes for $16—and is worth every penny.

Ear-splitting "sonic grenade" for waking oversleepers [BoingBoing]