I once got into trouble for drinking a bottle of ginger beer at work. (Ginger beer is also a form of soda.) To be fair, it was in a longneck dark glass bottle, and it looked a lot like beer. Someone walked by, did a double-take, and asked accusingly "What's that?" "Ginger beer." She looked scandalized and said "Maybe no-one told you, but you're not allowed to drink alcohol while at work." I was like "... alcohol? It's GINGER beer. You know - kind of like ginger ALE."
(It was the "maybe you didn't know, but you can't get blotto on the job" thing that cracked me up. I wonder if she was expecting me to pull a George Costanza. "Was that wrong? Because, I gotta tell ya, that's news to me.")