yeah ive done it a few ties, the one that stands out the most, i was with my mate just talking etc, then grabbed a lighter, lit the fart, he was laughing for about 15 mins............he still talks about it sometimes!! lol
i dont do it any more, as my dad said what happend if you got a blow back, as in the flame goes up your a$$.
i saw my mate do it , he was wearing track suit bottoms, he burnt a hole in them