I mean without additions. <img src="/images/graemlins/smile.gif" alt="" /> The trick of cooling water to about 25 degrees, which can be done if it is utterly pure and has absolutlely no jiggling. As soon as you tap it, it turns into a solid block of ice.

I know it CAN be done, but I've never succeeded. I'm still trying though- it would be as impressive a "stupid water trick" as tossing a coffee mug's worth of boiling water in the air at 20 below with no wind- it turns into snow instantly.