Before you enter the restaurant, cut some of your hair, or hair off of a pet. When at your table, place the hair all over the inside of the burger. When the line at the counter is long, and everyone is busy, cut up to the front of the counter, and start complaining about your burger. You will get another burger, and most likely, a lot of free shit so you will come back. You will also cause most everyone to leave, and people in the kitchen to get shit on by the manager.
Busy days are the best.
I just want a BigMac. This is a good secondary income for lazy people. If you plan on a big order, start off by telling the person you just want a soda. After they give a total and get ready to take your money, add an item. You can also have the cashier repeat your order as many times as you wish, also wasting time.