Perhaps you've heard of one or both of these pranks/hoaxes. The first is mainly an annoying nuisance done by teenagers the second much more serious.
Gallon Smashing. A teen (usually a boy) goes into a grocery store, picks up 2 gallons of milk or juice and proceeds to throw them hard to the floor so that they break. He then pretends to slip and fall feigning injury. Other shoppers run to his aid. Dumb.
Swatting. This has been done to political foes, usually by extremist liberals to conservatives (maybe liberal is too mild a term). Or, it has been done to Hollywood celebrities by who knows who. It begins with someone calling 9-11 ostensibly by the owner of a home which says "I just shot and killed my wife" or there's a hostage situation, or some other horrific thing. The police come, surround the place and, not knowing the innocent homeowner has no idea about the phone call, put the family in danger.
The most recent Swatting took place Saturday night at the Michigan home of Republican congressman Mike Rogers. This is a dangerous game being played.