Toothbrush CW key
This new toothbrush design has excellent plaque fighting abilities and allows you to key your CW transmitter while brushing. It is not available in stores but you can build it yourself easily.
A bended piece of plastic cable tie is put between the bristles. There it moves back and forth when brushing is carried out.
Pieces of solder wick act as keying contacts. Both directions of cable tie movement make connection (click the picture to enlarge it if necessary).
Wiring details on the backside.
An educational video on dental care and telegraphy: