edit: Thanks Ivan, also further research.
Pure water can be superheated to a few degrees above 100 degrees. However I remember reading reading that water can be superheated to even higher temperatures by covering it in a thin layer of oil that more effectively prevented the water from boiling. When disturbed the water can then suddenly boil and vaporise at a very fast rate. Apparently a microwave is an effective way to heat the water for this purpose.
However this can easily become very dangerous.
As liquid nitrogen boils at -196 degrees C, would using liquid nitrogen instead, with a thin layer of oil allow the same suppression of boiling, superheating, and sudden vaporisation to be observed but at much safer temperatures, as well as keeping the liquid nitrogen in it's liquid state at higher temperatures?
See also: physics.stackexchange.com/questions/29392/why-droplets-of-water-under-oil-explode-when-heated