Place a lighter outside of your clothes(underwear, pants panty's, shorts, so on...)put against your anus. Blast a large explosive flatulence (fart). While blasting one, light the lighter for a Blue Blazer flame.
A gaseous combustion released by the anus once lit with a flame causes a Blue Flame.
Today on the bus Sean put his legs on the back of the seat and took a lighter out and lit his farts. Causing a Blue Blazer.