Meet Koun Samang. When he was only three months old, his father found a python curled up in his crib. The dad removed the snake from the house, but it showed up again. It was released back in the jungle and then it came back again. It happened a total of three times before the Koun's dad finally gave up and just let the snake hang out with his baby. Seven years later, the kid and the snake (now over 20 feet long) are best friends.
Of course, that's not the only bizarre animal/human story friendship story. Cracked has five more and they are all equally fascinating.Link