I'll admit to have been drunk at work, once. I'm fortunate that I work in an office environment, and the nearest cube dweller is about 20 feet from me. I put some alky in my water bottle and sipped it while working. I got pretty well bombed as the afternoon wore on. My boss came in and talked about some issue or other; I was able to carry on a reasonable conversation and he didn't suspect anything. This happened about a year ago and I haven't done it since. Nor do I want to.