Sometimes there will be someone standing behind you in (or on, if you are of that inclination or training) line. They will almost always be a man in his mid-40s or 50s, and sometimes they will have a mustache. They will study the menu/their purchases intensely as if they contain the keys to enlightenment or the path to riches. They may actually believe their hot dog or DVD of Trading Spaces will mean the difference between success and failure. They are low-middle management men and have a lot of books about 'excellence'. They approve of the concept of 'service', as it applies to them, but not of the concept that you get what you pay for.
Sometimes the latter will address the former, perhaps about bagging speed or the insufficient fervor with which hot dog delivery is accomplished, and they will say "This is the express lane. That wasn't very express."
It is not appropriate to laugh, here, just as it is not appropriate to punch when the plaintiff, who is parked next to you, throws some trash on the ground. His mustache and tie afford him a certain dignity that must not be diminished.