Solutions to the Room-mate's hang over.

Over at "IMAKEPROJECTS.COM" they have just the solution for that room mate who enjoys partying during the week and is constantly late for Class, Work, or maybe the Job Classifieds:

A Grenade

Ok. Ok. The grenade would take care of the problem but would likely remove a small portion of your apartment or house. Instead why not create the next best thing - A 'Sonic' Grenade.

The little beast uses a 110db personal alarm as it's heart (easily purchased at the local 'dollar store'). They show the construction of two seperate models. The Standard edition:

And a really cool 'Deluxe' model, which uses a PIC for some fancier features.

I would think that although these projects are funny as hell (I enjoyed thinking of the limitless uses), they could potentially be harmful to someone's hearing in an enclosed space. I'm no expert on this, but please check into the possible hazards associated to 110db sound bursts before attempting the project yourself.