As those FF with KL CityHopper know, there is a certain tradition - "Cheese or Ham, sir?" It has been that way for decades.
A few months ago, I was on a flight where the cc came around with the sandwiches - cheese or turkey!
The look on her face was priceless when I said I wanted ham... with a wink, of course. Force of habit, y'see.
Well I chuckled, anyway (and so did she!)