If you want to play a funny game, try to order in Hong Kong a set lunch proposing TWO selections sandwich, and ask for a Ham-Ham... Guarantee, you are in for a long and complicated negotiation, and for an utterly instructional display of Psycho-Rigidity.
Hooray, after 20 min, I finally got my 2 selections Ham-Ham, but ONLY because that was for my cute daughter who is allergic to the other available choices (cheese, eggs, beef).
Believe that I'm kidding? Just try...