There's a lot of Japanese robots out there, but this is the only one that actually seems to be ready to tear humans apart. Maybe because it looks like a huge crab, giant steel claws included:

Developed by Tadano, with a three-chip CCD camera, two huge arms and four legs with joints totalling 29 degrees of freedom, the 2.7-ton, 6.9 x 12.6 x 6.9-feet (2.1 x 3.84 x 2.1-meter) Robotopusu is clearly designed to locate and destroy humans. Each of its arms can lift 220 pounds (100 kilograms.)

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Like the manufacturer says in its press release: I KONSEPUTOMASHINSHITA! (I don't know what that means, but it completely describes my feelings towards this beast.) [Impress Robot Watch translated]