Pizza delivery is a service in which a pizzeria or pizza chain delivers a pizza to a customer. An order is typically made either by telephone, or over the internet, in which the customer can request pizza type and size, and other items to be delivered with it, commonly including soft drinks. Pizzas may be delivered in cardboard pizza boxes or delivery bags, and deliveries are made with either an automobile, motorized scooter, or bicycle. Customers can, depending on the provider, choose to pay online, or in person, with cash, credit card, debit card or other means. A delivery fee is sometimes charged, although free delivery is also common. Ordering Ordering pizza for delivery usually involves contacting a local pizza restaurant or chain by telephone or online. Online ordering is available in many countries, where some pizza chains offer online menus and ordering. The pizza delivery industry has kept pace with technological developments since the 1980s beginning with the rise of the personal computer. Specialized computer software for the pizza delivery business helps determine the most efficient routes for carriers, track exact order and delivery times, manage calls and orders with PoS software, and other functions. Since 2008 GPS tracking technology has been used for real-time monitoring of delivery vehicles by customers over the Internet. Some pizzerias, such as the Ontario-based Canadian chain Pizza Pizza, will incorporate a guarantee to deliver within a predetermined period of time. For example, Domino's Pizza had a commercial campaign in the 1980s and early 1990s which guaranteed orders in 30 minutes. The guarantee was for 3 dollars off the order if broken but is often misremembered today as "30 minutes or it's free". This was discontinued in the United States in 1993 due to the number of lawsuits arising from accidents caused by hurried delivery drivers, but is still offered in some countries. Pizzerias with no time guarantee will commonly state to the customer an approximate time frame for a delivery, without making any guarantees as to the actual delivery time. According to Domino's, New Year's Eve is the most popular day for its pizza deliveries; others are Super Bowl Sunday, Halloween, New Year's Day, and the day before Thanksgiving. Unscheduled events may also cause an increase in pizza deliveries; for example, Domino's stated that its sales during the O. J. Simpson slow-speed chase were as large as on Super Bowl Sunday. Charge For