I have experienced this personally. Worked as a waiter. Waiters make mistakes when they are busy. When the food is served on someone else's table, you will make a mistake when you see the menu. Looking back, someone has already eaten the food. At this time, I can only have the cheek to tell the guests. Go to the guest table and tell the guest frankly. "Hello, I seem to have made a mistake about this dish. Do you want this dish? If not, I have to pay for it myself. " Fortunately, guests are easier to talk to. What people probably mean is: Never mind, this dish is what we ordered. It happened at least three or four times when I was a waiter. If you meet an accommodating guest, they will order for themselves. I can't help it when I meet a guest who is difficult to talk to. After all, it's nobody's fault that I made. I can only blame myself for being too careless.