Apple has released an unusual iPod software update:

The new 1.1.1 software update for iPod nano and Fifth Generation iPod provides an easy way for you to set a maximum volume limit to prevent the volume from exceeding a certain level. You can also assign a combination to prevent the setting from being changed which is ideal for parental control.

Seems like a much more efficient use would be to steal your friend’s iPod (mine is immune, being 3G not 5G…) and to set a low volume limit, with an odd combination, and watch them struggle.