At very high altitudes and very low temperatures, water sometimes is not frozen, nor is it rain or snow. It just hovers. HOVERS! And, then when it is run into by something solid... say, an airplane... it freezes upon that contact and clings to the object as ice.
If there is anything more awesome than that, I don't know what it is. (That we have been able to discover this, I mean.)
And it is from one of the finest pieces of journalism I've read in a long time, found here, and if there was a way I could block Meggie from reading the link I would. If you are afraid to fly: Don't Click!