When you find your self trying to hero a paper that you have no chance completing two hours before its due all you have to do is just submit an old draft or if you're really behind a completely blank document saved as the correct name of the paper/project. Then the day after when you actually finished the paper send the prof an email saying something to the effect of "I think I accidentally submitted my old/wrong draft, here is my final paper."
I have never had this not work aka be marked down or not accepted for being late.
Obviously you can only use it once per class.
Live long and prosper.