The New York Department of Sanitation (DSNY) had some useful advice for people caught on camera “leaving old mattresses” in the street. “You know you don’t need to dump your mattress on a dark street, right?” they said. “We’ll pick it up.”Footage posted by the DSNY shows the fly-tippers in action by a cemetery in Glendale, Queens.According to the DSNY, the van used to dump the mattresses was impounded and a summons was issued. Credit: NYC Sanitation via Storyful