If you're having a bad day and figure the pizza guy is a good option to take your frustrations out on, there may be more fallout than you expect. The deliveryman may take orders, bus tables and even prepare the pizzas. This is not a person you want to make angry. If you're rude, next time you may discover fewer toppings on your pizza or worse, so remember to play nice. And you never know, the pizza delivery man could be having a bad day of his own. If he's dealt with several surly customers, he may deliver a swift kick along with your pie.