Sound Bomb
You wanna be really annoying?
I have found something what suites your purpose very well.
The Soundbomb designed from Felix Hardmood Beck has an integrated soundmodul. That module makes it possible to record any given sound and then activate it through a motiondetector.
As a Non-Visual Graffiti, with its origin in streetart, Soundbombs give the possibility to tag a place in an accoustic form: a welcoming greeting at the entrance or a warning of a bad restaurant. Each owner can leave a personal message anywhere and at any time. Soundbombs can whistle, laugh, belch or recite a poem.
BTW you cannot simply buy a soundbomb – you have to qualify for one:
One can apply for the purchase of a Soundbomb – only those who deserve a Soundbomb, get a Soundbomb!
see more info www.soundbomb.com