This wasn't me drinking at work, but something I saw a couple of years ago. I was going offshore out of Norwich, where the Bristows helicopter check-in is right next to the bar in the check-in area at Norwich Airport. All the offshore guys sit around there waiting for the check-in time, or to be called through to security, so I'm sitting there watching the flight before mine check in and one of the guys checks in, heads round to the bar and buys a pint and promptly sits down at one of the tables pretty much in front of the check in girls at the desk. Everyone just sits and looks at him for a few seconds in shock as he takes a gulp then they call over security.
Probable result? Sacked on the spot by his company.