It's rude to throw food at your significant other.
James is having dinner with his wife at a fancy restaraunt.
James wants to enjoy the meal.
James spends the meal having lively and entertaining conversation with his wife and enjoying the food.
James rips off a small piece of his dinner roll and tosses it at his wife when she isn't paying attention.
James' wife has a great time as well and really enjoys the experience all around.
James' wife does not find the action funny in the least and gets angry at him for doing such a thing at a fancy restaraunt.