Not even at restaurants.
I worked at a video game store where the boyfriend of a co-worker used to come in, step into the employees only back room, and sell weed to me and the assistant manager. On the last day of working there, one of the store managers drank Jaegarmeister while closing up the store. Also made out with a co-worker I had a crush on in the downstairs storage area.
A few years later, I found a temp job where during the lunch break, I bought oxycodone, quickly crushed and snorted it, and went back to work all cheerful and high.
I'm not proud of this behavior, but just saying I personally know that many shenanigans do occur in the workplace.
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"I'm sorry, I seem to have a tin ear for other people's feelings..." -Naoto Shirogane