When you meet someone new who instantly gets you your sense of humor and your attitudes and your worldview even if theirs are different - and you get them in return. You both talk and talk and agree and laugh and nod and yes yes of course you should get another round of drinks.
There is something in the unselfish and self-sacrificing love of a brute which goes directly to the heart of him who has had frequent occasion to test the paltry friendship and gossamer fidelity of mere Man.