After Robin Williams' (probable yet unconfirmed at the time of writing) suicide at the age of just 63, the question is once more in the air - are comedians more prone to depression than, say, plumbers, gamekeepers or human resources managers? Does the iconic 'tears of a clown' cultural trope have any basis in fact? My instinct is to say no, it doesn't - but it is just that, instinct, for I have no data. It is a difficult case to prove, for the evidence to the contrary seems so overwhelming. When a comedian like Robin Williams or Tony Hancock takes their own life, with all the consequent publicity engendered by those tragedies, it is definitely tempting to conclude 'there goes another one.'