Yes, I see what you are thinking. I read about the "exploding coffee" scenarios with its super heated water. Boy, that'll wake you up in the morning in a hurry
Not sure how you would deal with the expansion of the water as you super heated it? Guessing it would be in a vacuum sealed container that can take a lot of pressure until you inject it into a cylinder? Wonder what the container material would have to be made of?
Likely you've seen this site here also then which is full of entertainment. I posted the link here somewhere before but here it is again.
http://www.amasci.com/weird/microexp.html