Never before work. But during the day, more times than I can count. It started out in the mid 90's, I was working at a huge internet startup and it was the norm. I don't even mean going out for lunch, because nobody went out, we all ate as we worked. But we had a fridge in the designer quad, and it was open for anybody to drink at any time. Many times we were drunk while working a 16 hour day. Fast forward till the last few years. I have drank occasionally alone in my office. The only person who knows is my best friend, she has figured out I was loaded a few times, but fortunately/unfortunately she finds it funny. I haven't done this in quite some time, ever since I've tried cutting back. What was once fun and accepted is now a potential career ending stupid decision.