Today at work, I was asked to weld the bracket on the bottom of an office chair. WELL...Little did I know that there is a highly flamable gas inside the cylinders on those chairs. WOW!!! Luckily the cylinder burned through and released the gas instead of going BOOM. And also luckily..I do listen Rock, I had all my protective gear on. Even though I am getting old and fat, I can still run from a flame thrower. This thing blew about an 18" pressurized flame for about ten seconds and then quit. I figured it was empty and safe to finish at that point. So I went back at it with the welder. Guess what...More flames shooting from the chair. That's enough of that. Never again! LOL! (Now that its all over)