Only two problems with this:
- 'td need to be kin loud to hear it in any form of 101
- 't person on 'tother would need to know his/her 'left' from 'right'
Then of course, given you've overcome these, you'd need an agreed 'my' left or 'your' right...
Go on Austin, build one, after all, it can't look any sillier than this:
Martyn