Suppose that rain fell on the Moon? This is a question that Sidney Nagel of the University of Chicago in Illinois and colleagues have asked and to which they found a remarkable answer: the drops would not splash. It is common in fluid mechanics that things cannot be explained in detail because the Navier-Stokes equations are so complicated, but this finding really flies in the face of intuition. It turns out that splashing is reduced as air pressure drops, so the air plays an integral role in the formation of a splash. Below about 0.2 atm of pressure, drops of alcohol simply do not splash at all. So, suppose vodka spilled on the Moon...
Further reading
New Scientist 2 April 2005 p14.