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Favorite Answer
Hypocrisy!
Or the fact that humans constantly lie, and some do it so well.
I dare all of you to tell nothing but the truth for a whole day.
Boy
They are ignorant and most lack practical rationality.
-Edit-
Satyendra, you've been misinformed about humans only using 10% of their brains, when in fact, a person probably uses 95-98% of their brains. They just don't uses some parts of their brains at certain times; it's not like you are trying to solve a problem, or solving a math problems at all times of the day.
Robert David M
Incredible arrogance--pretending they know things they barely have acquaintance of, pretending to abilities they almost completely lack, disrespect for scientists, real talents, etc., willingness to pronounce value judgment loudly when they haven't a clue what normative level of good is--such as about TV shows, actors, political aspirants, experiences, arts, scientific hypotheses, beauty.
This explains why I like dogs and trees and stars so well...
Raj
Greed
TheMadJoker
Flaws are what make us human. If we each didn't have imperfections, there would be nothing to highlight our fine points, right?