I usually always try to count with the cashier the change she's giving back. But, it has happened I didn't and just took the change and later found out I'm 100 bht short. Do you suck it up to experience or do you go back to confront?
Me, I feel like any confrontation over change has to happen the moment she gives you change. Not after you walk out the door, count the money and discover you got the wrong change. so, if I don't catch the mistake immediately I chalk it up to experience.