Extra Cheese, Please
This one just seems plain resourceful. No crime committed here. The person below admits that they bring in their own cheese to McDonalds and morph their hamburger into a cheeseburger. Hey, it’s a money saver. Not much of one, but a money saver, nonetheless. Now, you’re getting the best of both worlds!

provided by constative.com
It’s like sneaking in snacks into the movie theater. If no one is the wiser, then why does it matter? People bring outside beverages into restaurants all the time that they purchased from other establishments. The same rule applies here. So, enjoy your from-home cheese on your cheeseburger, stranger!