This was the mesmerising scene as a US scientist conducted a crazy experiment creating an upside-down smoke vortex that went down in flames.<br /><br />Filmed in Seal Rock, Oregon, on Sunday (December 2), the experiment shows not just a normal miniature tornado, but one that's upside down within a bubble that, when exposed to a naked flame, bursts into a gulf of colourful fire.<br /><br />The filmer commented: "It's a soap bubble filled with glycerine fog and butane. I spin the air inside the large bubble and then pop the bubble film in the disk that the bubble is attached to. <br /><br />"An inverted tornado forms and pulls the fog butane mix up and out the hole in the disk. It's pretty fun."
