Around here a common hazard at lunch are the gaggles of office ladies, usually four, ages 20 to 50 or so. And they're all trying to convince each other they're much more conscientious about eating healthy than they actually are. They'll wait till they're up to the counter or till the waiter gets to the table then go down the menu asking stuff like 'is the cheese gluten free? I'm avoiding gluten you know' or 'does the pine nut salad have nuts? I might be allergic.' Then having exhaustively gone down the menu they'll all get a salad and dump on all the dressing while saying things like 'oh my, I didn't think the 5 cheese candied walnuts and cranberries salad would come with so much cheese! But it would be terrible to waste it...' and then they all conspicuously make sure to leave some lettuce, see, I didn't eat it all!
Kamisama help you if you get stuck behind them in line, we know to actively avoid them now. But if they've captured your waiter all you can do is shrug and relax.