The Think Geek Annoy-a-Tron is a toy designed specifically to get you beaten to a pulp. Just activate it, hide it in the room of the person you want to annoy and watch with childish glee as they search with increasing desperation for the source of the annoyingly short and random sounding beeps. $9.99.
The Annoy-a-tron generates a short (but very annoying, hence the name) beep every few minutes. Your unsuspecting target will have a hard time ‘timing’ the location of the sound because the beeps will vary in intervals ranging from 2 to 8 minutes. The 2kHz sound is generically annoying enough, but if you really really want to aggravate somebody, select the 12 kHz sound. Trust us. The higher frequency and slight ‘electronic noise’ built into that soundbyte will make a full-grown Admin wonder where his packets are.