15 Pizza’s end prison siege. Considering there were 20 inmates, getting their demands down to 15 pizzas was probably the kind of job only the most skilled hostage negotiator could sort out. Unfortuantely the report does not say what Meal Deal they used, and if the screws got the free 1.5 litre of Coke and tub of Haagen Dags.
Or indeed if they tipped the delivery driver.