Two weeks ago we were learning the concept of superheating of water in my Chm 31 class. Superheating basically happens when you heat a liquid above its boiling point temperature without boiling. It can be done by simply overheat water in a microwave at home, however, this is dangerous because once the superheated water is disturbed, some of the water will explode. And here is a interesting mythbuster video demonstrating this phenomenon!
Do not try that at home!