Warning: Proof contains language which may offend some people
Blackouts, bad hangovers and even an embarrassing incident with Helen Clark wasn't enough to stop Guyon Espiner drinking, but two years ago he finally quit the booze.
No one had ever asked the journalist and broadcaster why he drank, but when he stopped everyone asked him why he didn't. Wouldn't he have just one drink, they asked? C'mon.
Now, with camera operator/editor Claire Eastham-Farrelly, Espiner has made a documentary about saying goodbye to the bottle, New Zealand's drinking culture and the influence of the alcohol industry.
Watch the full documentary here: