Cell Phone Proximity Alarm

I propose an implanted chip, linked to your cell phone, so if you walk more than a set distance from the phone, you get a quick, but sharp electrical jolt to your bladder causing you to piss yourself. Also available is the anus model (with obvious results). Not only would this remind you to get your cell, as you are (re)showering/changing, it would also condition you not to forget it in the future.