The office happy hour splits close to down the middle, and the halves are drawn largely by age. YouGov's 2017 survey of employed Americans found 46% never attend one, against 4% who go every time, 8% often, 17% sometimes and 23% rarely. Among employed millennials, 62% had attended at least once, compared with 52% of employed adults overall, and men were more likely than women to attend at least sometimes, 33% to 22%. The reasons attendees give are not mostly about alcohol: 45% said it is a chance to get to know colleagues better, 33% a way to relax with work friends, 26% networking and 23% cheap food and drink. The sharper disagreement is about what happens when a colleague drinks too much. Among those aged 55 and over, 50% said they would judge that colleague negatively; among millennials only 19% would. That is the real fault line: whether the event is social time where ordinary rules apply, or work time where professional judgement continues after the first round.