Moon Unit

As obesity rises and trousers get shorter, there's been a worrying increase recently in the incidence of Unintentional Bumcrack Display (UBD).

Distinct from the fashion of wearing your trousers round your ankles so everyone can see your underwear, UBD causes inconvenience to those around you, and embarassment to yourself when your slip is pointed out (or often, isn't).

Hence the Moon Unit. The Moon Unit (named changed from Moon Alert in honour of Ms Zappa) looks like those little USB extension spools, but with a tilt sensor built into the spool, and a clip on each end of the 'cable'.

Clip one end to the bottom of your shirt and the other to the top of your trousers (at the back). As long as the top of your shirt hangs below the top of your trousers, the tilt sensor hangs downwards and the device remains silent (and discreetly hidden behind your shirt).

As soon as you sit on a barstool and lean forward (one of the many positions that cause UBD) and your shirt-top rises above the top of your trousers, the tilt sensor flips, and the Moon Unit beeps to let you know of your faux pas before serious trauma occurs.

A more discreet (and possibly pleasurable) option would be a vibrating alert. The precise design is left as an exercise for the reader.