DeviantART user Mathijs Sterrenburg modified his toaster to look like the original Nintendo Entertainment System. Now is the time where I would usually make a crack about a "blowing on it" if it broke, but in this case, I find such a joke is actually appropriate: if your toast is too hot, blow on it!
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.