When you get your feet washed and massaged, the closer you are with the technician, the worse her service gets.

When you go to the vegetable market to buy groceries, the more familiar you are with the people there, the more aggressively they overcharge you.
When you renovate your home, the nicer you are to the construction workers, the worse the quality of their work.
On a certain ride-hailing platform, at first your rides really are cheap, but after a month or two, the same destination ends up costing more than one-third extra.
When you start working at a new workplace, the more humble you are toward your coworkers, the more they treat you as an outsider.
When you go to a 4S store for maintenance, the more easygoing your attitude is, the more they assume you don’t understand—and the higher the quote they give you.