I was at the post-conference cocktail hour, where everybody tries to juggle drinks, lukewarm appetizers, and business cards. I was staying at a hotel a couple blocks from the conference center and my only bag was my giant laptop/paperwork briefcase, so I'd just brought some cash and the room card.
Nobody would serve me a drink. C'mon! I've got my conference badge with my scientific and clearly non-entry-level job title! I've got my little conference drink ticket! And it's a long, cold trip back to the hotel for my driver's license.
So I got my coworkers to order me a glass of wine and then sneak it to me when the conference staff wasn't looking.