wow, that lemon juice revelation is really awesome. I have seen similar practices in certain FMA's. When they do this is looks like they put something like potatoes into the oil, I often wondered if that somehow lowers the temperature.
Regardless of whether of not any of these things lower the boiling point of water that sure does have to be uncomfortable, simply training to endure the pain of burning liquid (whether it's stripping your skin or not) has got to make you pretty hard core
