If you were ever a waitress you have come across the soda dilemma on occasion. Guy asks for booze of choice and soda, soda? what kind? in my neck of the woods that could mean Coke, Sprite, etc... his booze of choice could have gone with any soda choices, he looked at me like I was a moron, naturally he meant seltzer. Growing up we had pop.
'Doggy bags' have also gone out of fashion, they are now boxes. We were in a different state a number of years back and I asked for a doggy bag and the server had no clue at all as to what my request might be.