A 16-year-old Long Island boy fell 50 feet into a shaft at the Queensboro Bridge while trying to pull off a TikTok challenge, police and law enforcement sources said. Cops responded to a 911 call on the Queens end of the East River around 5:45 p.m. Monday and found the teen stuck in the shaft, an NYPD spokesperson said Tuesday. First-responders pulled the boy to safety and rushed him to New York Presbyterian Hospital Weill Cornell, where he was listed in critical but stable condition, police said.