Adam Feeley, director of the Serious Fraud Office, let more than his hair down when he invited staff to a celebration of the laying of charges against Bridgecorp director Rod Petricevic. He also let down his position.
He did not quietly invite his team to a drink, which might be normal at the end of a busy week, he issued the invitation by email, announcing they could "celebrate" with champagne "that previously resided in Rod Petricevic's office".
Email is a dangerous medium. It is impossible to control its circulation and it is easily saved for evidence. Worse, there is something about the medium that tempts even cautious people to be clever, ironical and indiscreet.
Mr Feeley is just the latest sender to discover that what seemed entertaining when he pressed the button loses much of its charm in the public domain.
It may be argued whether the greater offence is that he helped himself to Bridgecorp's bubbles in the first place. Mr Feeley has explained that he came by it in his previous position heading the Eden Park Redevelopment Board. The project used premises previously occupied by Bridgecorp and "three or four bottles of champagne were left behind after the sudden exit of the directors", he says.