Everyday items can defy common sense. Take this icicle that formed on the banister of our back steps just after the new year:
In advance, I would have guessed that water dripping off the end of the railing would have fallen downwards—you know, gravity and all—and formed a vertically-hanging icicle like every other one I've seen in my life. Yet the surface tension of the water presumably let each melted drop slide over the previous one, and the temperature was just right to freeze it before it dripped off the end. The result: an icicle matching the angle of the banister.
Even more bizarre, the tip curled up slightly. The whole thing was about 10 cm long. I wanted to see how much further it would grow, but the weather conditions changed; by the next morning, it was gone.