When I was working as a Receiving Clerk at an army surplus in Detroit, I  rarely had contact with the customers except for those rare (and  hilarious) occasions that I had to go out on the floor to set up or move  stock.
At the end of the day, almost closing time, I go out on the  floor to pull some seasonal items into the stockroom for storage. Low  and behold some guy sees me come out of the backroom and asks me a  question, he wants to find a canteen. Alright, no biggie, I take him to  the isle with the canteens and show him the different ones. He looks at  quite a few and ask questions like capacity and what they are made off.  Finally he asks the question: "Which one of these would be best suited  carrying Alcohol?"...... ok.
So I show him the steel and tin canteens.  He chooses a larger steel canteen and says thanx. As he walks away I say  that if he prefers we have flasks made specially for caring alcohol. He  frowns and says, I am quoting now "Only alcoholics carry flasks".
I barely got back to the backroom before I doubled over laughing
