Fire tornados, a pretty but frightening phenomena, happen in nature when wind conditions are right and fire is present. You can produce one yourself, although I wouldn't recommend it. Now the Slow Mo Guys (previously at Neatorama) show us what is happening down to the finest detail. And it is beautiful.
Do I have to add that you should not try this at home? It’s been done, and if anything goes wrong, you could suffer injury, loss of life and/or property, and lawsuits. -via Tastefully Offensive