Man we get it non stop. There are few codes in NYC that you never want to hear on the radio: one is 10-13 and the other is 10-85. First one is an unconfirmed call: member of service in trouble such us off duty cop in accident or reqest for help. Later, 10-85 is when stuff really hits the fan: violent out of control perp, confirmed accident, chase with weapons drawn and assault on member of service while on duty. Any of those codes come in on the radio and you just go. No questions, no ifs and buts just go. I personally called it only once when some coke raging lunatic decided to explode on me and my partner was nowhere to be found and 100 lbs medical student was praying to be back in Pakistan. But anyone can sort of initiate it by placing a right sounding phone call such us: "i'm an off duty officer and I have been shot at this address". Dispatcher puts the code out and we roll to find nothing. It's so freaking easy to do with cellphoens now since even if they are not working with regular phone service they still can be used to place 911 phonecall. We constantly respond to 10-13s in projects or shady areas just to find nothing. After responding to a "a shot paramedic crew under the bridge" one of the Lous made a nice observation and said: this would be a perfect way to measure quality, time and strength of the response to an incident. We laughed at the paranoid one but later on after some thought got put into it than it made sense. You want to set something off in NYC but measuring our response time and who shows up you can pretty much figure out how much time do you have to do what you got to do. But belive me I would love to get my hands on that someone who is doing them prank calls and than promptly transport him to a trauma center.