This boxy guy is called Kuratas, otherwise known as Vaudeville, and he stands 12 feet 5 inches tall. He weighs about 4.5 tons and is diesel-powered. Do not smile at him. He will shoot that grin right off your face.
Kuratas is a real-life mech from (where else?) Japan, and it's an art project designed by Suidobashi Heavy Industry. Iron worker/artist Kogoro Kurata, at right in the photo above, built his namesake robot and debuted it at something called Wonder Fest 2012, which took place over the weekend.