I did this one with microwaved soup, i followed all the instructions. At the end of the "cooking" i took it out to stir it and there must have been a air bubble in the soup and it exploded all over my face, luckily i was by a sink so i didnt burn myself. damn you chunky soup.
As far as I know you need to use distilled water to get that effect. Regular tap water has too many impurities.
So don't be an idiot and microwave distilled water.