Annoying Buzzer

Materials:

 ¥ 9 Volt battery
 ¥ Circuit board piezo buzzer (Available at 
   Radio Shack for $1.99, or less depending 
   on your level of honesty)

Procedure:

 ¥ Connect the buzzer to the top of the 9 volt battery.  
   It should stay by itself because it has the PC board buzzer

 ¥ Place it in the area of the person you want to annoy.  
   If you hide it really well, it will annoy the person until 
   the battery dies.

 ¥ Leave before you go insane


Special Thanx to the Anarchaic Physico Man for this one