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Social stunts: Why teens dangerously show off for eachother

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(PIX11)-- For years, daredevils in New York have used the subway system for their exploits, including clinging to the side of the cars (known as skylarking) or riding on top of them (surfing).

Since 2013, the Metropolitan Transportation Authority has received reports of 329 skylarking or surfing episodes, with two ending in fatalities, said Kevin Ortiz, an agency spokesman.

With the proliferation of smartphones, some surfers and skylarkers have taken to recording their exploits and posting them online.

Dr. Jodi Gold explains the behavior of these daredevils and why they have the urge to risk their lives in doing so.