Similarly, I have a coworker who drinks scotch from a coffee mug at work.Last fall, I went out for a walk with my DW. While she wasn't looking, I threw a beer into an aluminum water bottle. After we walked a bit, I took a slug or two from the "water" bottle, then offered some to her. She took a slug, then looked at me funny, and I was laughing my butt off! I realize that, hell, you could drink alcohol ANYWHERE as long as you put it in a take-out coffee cup or a "water" bottle.