While true, that can't be all that's wrong with it, because otherwise if you did this even once, turning all your mass to waste heat, you'd still have violated the First Law. It would still be more useless energy than you started with. Right?
Energy tends to become more useless, so I don't see how that's an argument against my point.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous "stupid" questions thread is at almost 500 questions in about a month, so I think it's time for a new one.
Also, I have a new "stupid" question.