Although I assume some people would rather be burned alive rather than use it, William Holmes has invented a low cost breathing apparatus for use in case of fire. If you find yourself trapped in a burning building, or just jonesing for a hit of jenkem, you merely have to slip Mr. Holmes’ tube down your commode and start breathing.
Mr. Holmes notes that even though you might breathe in a small amount of sewer gas, this is a small inconvenience in comparison with saving your life. I guess that would be in the nose of the behoser. I would also suppose it might be more than a little dependent upon the type of structure in which the toilet is located. I just do not see a big call for these novel hoses in frat houses or truck stops – at least not for use in case of fire.