Funny story, the other day this kid nearby was trying to heat up a piece of square bar to bend into an L shaped, using just some propane and one of those tips you would preheat a part or burn brush with... I was standing there like

watching for a while as nothing happened... Yeah that ain't going to ever work without an oxygen tank, let me get my little O/A torch and get 'r done.... I come back in a minute, he fires it up and obviously heats it to a nice cherry red pretty quick. He makes the comment, "Did you ever notice how Acetylene has a different smell?" I just smiled and said, "I think that's a burning paint smell." and point to him burning all the paint off the top of his vise...
It was a cheap chinese no-name, so no big deal.... Still funny as hell though, guess you had to be there.