The first can arguably looks cool even though throwing it into a running lawnmower is about the stupidest thing you could do. The orange can falls flat, but if you look close you can see a little flicker of flame. Nothing big happens with the grey can, but the green can is where the magic happens. Watch in slow-mo how a little spark turns the green mist into a giant ball of fire. At least these numb-skulls made a pretty cool video.