OT Health and Safety
 

http://www.bbc.co.uk/programmes/b00yyc83

Before commencement of a nodding aquaintance a contract must be drawn up
-to ensure both parties honour their obligations to nod and smile...
years down the line people change,
one day one person nods and the other doesn't,
without legal recourse you could feel slighted,
you could be taken to court.....

[g]