The phenomenon of best friends is hard to explain. Best friends are not bound by common sense commonalities, and they can be entirely different from each other, even opposite to one another. But that's what usually makes friendships so damn interesting. One of them might be a loudmouth, while the other is a bit more reserved; one of them could be very tall, the other short; one of them might be smart, and the other one, how do you say, not so smart.