I heard a version of #2 the other day regarding checking out a potential girl friends personality.
Take her to dinner, but before arriving tell the waiter to intentionally make a mistake with her order.
So when you arrive at the restaurant with her, if she orders chicken, the waiter will giver her a burger. The goal is to see how she treats the waiter for making a mistake.
One for the ladies - see how he acts when he’s a little drunk/inebriated.
Yup—the “waiter” test is one reason old time job interviews included taking prospective management hires out for a meal.
They will treat their subordinates the same way they treat the help in the restaurant.