The ThinkGeek Ringtone Annoy-a-tron from ThinkGeek

http://www.thinkgeek.com/f3a5?cpg=yt

-Pranking device plays ringtones at random intervals
-Drive people bonkers looking for the missing phone!
-6 settings to mimic frequently-heard ringtones:
-Red fruit style
-Black-purple fruit style
-Know Kia style
-Vibrate
-Office desk phone
-Random mode

-Adjustable volume can be set from barely audible to super-annoying
-Magnets attached so you can hide it in more devious places

To use:
-Turn on.
-Set volume level.
-Select your ringtone (sample will play).
-Hide the device!
-Keep a straight face.

-Battery: CR2450 (included). One battery will power the Annoy-a-Tron for over 4 weeks.
-Dimensions: 2.5" x 1.5" x 0.35"

Music by Computer Music All-stars "Mild Fantasies"
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