Don't take orders from children...

For the second time in as many weeks, I've had to tell the staff off in a fast-food place for entering into the till the requests that our 6-year-old daughter has made. Today it was in McDonald's, where my wife was surprised that her order was so expensive, and then noticed that extra items were being loaded onto the tray. When this was queried, the assistant said that my wife had ordered X and our daughter had ordered Y, to which I said "You take the order from the adult, not from the child," and after I repeated this, the extra items were removed from the tray and we were refunded the difference.