you don't think much of it when you pour a bottle of liquid upside down and let the contents run out. there's a steady stream for a bit, and then it dissipates into quick drops, and then eventually to slow drops forming on the rim. they each cling for a few moments longer than than drop that preceded them, but they all eventually give in to gravity and plummet to wherever you are pouring them. and then the next day, or at some point later, you turn the bottle over again (out of suspicion. you've never trusted liquid) and sure enough -- more liquid! how does this happen? water wants to be together. when you are initially pouring it out, the leaders of the volume yell at the rest, "hold! everyone just hold onto the side!" but some of the remaining volume is weak-minded and curious. they lean out to see what is at the bottom of the hole, and gravity grabs them, and they tumble out. once you have satisfied that you have sufficiently emptied the vessel, the leaders take stock of who's left. "this is all that remains of our once proud society. we will miss the departed, but we are lucky to still have our habitat." and if they are lucky, they remain there until evaporation takes them to liquid heaven. but if they're not, curious you comes along and turns the vessel over once again. you just had a hunch that some of that no-good liquid was still hiding in there somehow. and they were. they slid down from clinging to the walls, and they huddled together in the bottom, thinking they were safe briefly. nope. your eradication was not complete. but at least they are all together this time as you mercilessly pour. "i will see you on the other side! don't let go of me! if we make it out, let's pool together once we land!" and they do ...for a bit.