From a traditional Apache story..
young man saves snake that is hurt, blah blah..
snake heals, blah blah.
Finally the young man set the snake on the warm, desert ground. Immediately the snake turned and struck the youth, pouring poison into his wound.
"What have you done?" cried the youth. "I have saved your life, and now I shall surely die!"
"What have you done?" said the creature. "I am only a snake. You knew what I was when you picked me up."
These guys were playing with tigers... Its amazing that nothing happened until now.