Clearly this hasn't been modified to be imported to the states. The size of the cupholder is a dead giveaway.
Eric Streenstra has created quite the paragon of green energy. And yellow energy. And blue energy. And red energy. You get the idea. This go-kart is still able to... well... go, while being made almost entirely out of LEGOs. I just hope that doesn't include the pedals. I think you know why.
Deviant Artist Midnight Angel put together an arm blade stylized after the ones used in the Assassin's Creed video game series. Using a drawer opening mechanism, a spring for a screen door, and a throwing knife, the weapon works surprisingly smoothly. The full instructions are on Angel's page, and you can see it in action below.