Monster Slippers

A pair of children's slippers, in the shape of monster feet. Nothing unusual. However these slippers have an extra feature. Tucked away inside each slipper is a small battery powered speaker unit, operated by a tremble switch. Every time the unit is moved or shaken, the switch operates, and the box plays its sound effect - the sound of a monster foot hitting the ground.

So on the one hand you could certainly detect any approaching little monsters; on the other hand (or foot should I say?) the noise would probably drive you crazy fairly quickly!