Ahaha, I love this question! The most on fire I've ever been was when I was using a lighter and leaning forward, and I happened to have used hair products not long before. Suddenly, there was a big 'woosh' and the flame had gone right up along my hair! Thankfully my hair was fine, and all was well. I had been on the phone at the time, and the person in question couldn't believe how 'special' I was. >.<