I like to hand someone a Tungsten cube, let them experience the weight, then toss them one of Magnesium that looks exactly the same. "Here, catch!" They act l

I like to hand someone a Tungsten cube, let them experience the weight, then toss them one of Magnesium that looks exactly the same. "Here, catch!" They act like I've just thrown a cannon ball at them but then they're amazed because it's as light as a cotton ball (almost).