i did this some years back. i was just wearing my robe. i moved the robe out of the way, lit the flame and farted. a blueish flame shot out about 1 foot maybe, and it singed the hairs on my ass, especially around my asshole.....it scared the shit out of me at first, but then i almost died laughing, and so did my gf. you couldnt really smell the fart, but the smell of my burning asshole hairs was all in the air.......smelled pretty fucked up.....i hope you guys have enjoyed one of my embarressing/funny experiences in my stoner life.......