Suffolk County cops responding to a burglar alarm at a local bank got more than they could handle -- a fully grown male deer trapped inside and trashing the place, with the whole thing caught on video. The mayhem unfolded Sunday, when police responded to a possible burglary at a Webster Bank branch in the Long Island hamlet of Ridge and found a window smashed and an intruder inside -- a frightened buck thrashing around to try to break free, footage posted by cops on Instagram shows.