put a cup of hot and cold water in freezer, see which one freezes first... end of arguement
Its not quite as simple as that, I did quite a bit of research on this phenomenon a while back. It relies on certain conditions to be present. the factors are:
* the ambient freezing conditions ( ie 0 to -whatever degrees )
* the temperature of the cold water ( 1 to 15o degrees )
* the temperature of the hot water ( 50-100o degrees )
* + many other things, like water density, volume, etc
You see the factors are HUGE, what we define as cold or hot isnt exact! Apparently its not an easy test to replicate!