What is the most amazing looking chemical reaction?

To get this started, let me point you to the rather startling chemical clock, the Belousov-Zhabotinsky reaction. Lest you think this is a fake, and not just a specific set of chemicals combined then excited past equilibrium, see the explanation of the BZ reaction here.

And yes, it is absolutely amazing enough to deserve a name that complex. But after watching the video of it, you will see thumbnails to a ton of additional examples of chemical reactions that exhibit self organization out of apparent chaos. Or you can search YouTube for things like chemical clocks, Briggs-Rauscher Oscillating Reactions, or Google non-equilibrium thermodynamic chemical reactions.

Which is the absolute coolest. Please post a link to your favorite, video of such a reaction and feel free to comment or contribute about what these phenomena represent to you.