It's improper to modify someone's order at a restaurant.
Jake is a waiter at a restaurant and a customer named John has just ordered his expensive steak extra well done to the point of being burnt.
Jake wants to ensure that the steak is at best medium if not rawer.
Jake spends a minute extolling the virtues of a steak done at medium or medium rare.
Jake writes down John's order but changes the steak to be medium before relaying the order to the chef.
John is convinced by Jake to switch his choice to medium rare and to his surprise enjoys the steak more.
John is livid when he sees his steak is not burnt to a crisp and demands that Jake return the meal.