You can take the animals out of the wild, but you can't take the wild out of the animals. A family found a snake trapped in the walls of their home in Australia, but when rescued, the snake's first instinct was to bite the hand that rescued it. The handler was a pro though, and took it all in stride.
Some tourists at the Kapama Private Game Reserve in South Africa also got up close and personal with wildlife, but their new acquaintance was a bit bigger than a snake. A small herd of elephants passed by them on the trail, bt the elephants seemed familiar with humans, and passed by without incident.