Don't you just hate it when your neighbor's dog starts to bark in the middle of the night for no sane reason at all? With the PetSafe Bark Control System, you can reign in just about any canines who seem to have a case for incessant barking no matter what time of the day it is.

This tiny box emits a pulse that only a dog can hear, disorientating it so that the said pooch will learn to associate barking with aural discomfort.

Theoretically, this ought to make them shut their trap, but I'm afraid it might make them mute forever - what happens when there really is a baddie trying to break into your home, and through months of PetSafe Bark Control System treatment, your neighbor's rotty remains silent?

You can pick this device up for $29.99.

Source: http://www.shinyshiny.tv/2008/01/pavlovian_tone.html