Water: Raindrops

Raindrops cover our planet and the most iconic picture of a raindrop is like this guy:

But this is not how raindrops are actually shaped more like hamburger buns.

It is "like a tug-of-war between two forces: the surface tension of the water and the pressure of the air pushing up against the bottom of the drop as it falls. 
When the drop is small, surface tension wins and pulls the drop into a spherical shape. With increasing size, the fall velocity increases and the pressure on the bottom increases causing the raindrop to flatten and even develop a depression.
 Finally, when the radius exceeds about 4 mm or so, the depression grows almost explosively to form a bag with an annular ring of water and then it breaks up into smaller drops."