I nearly murdered myself using this method last winter.  I had just spent my Home Depot gift card on a little heater, and decided the first task would be to tidy up some greasy junkyard parts, using some chlorine-infused brake cleaner.  The overspray from the brake cleaner made its way into the heater, and badaboom, gas attack.  I've never coughed so violently!  I had to vacate the garage, and let it air out.  Naturally I learned my lesson, so I only gassed myself one more time that night.   

  The sad part is that I was entirely sober.  My lungs hurt for a week.  Learning is fun!  
