Taiwanese veterinarian Chang Po-yu thought he had successfully tranquilized a zoo Crocodile. When he reached out to remove the tranquilizer dart from the croc, the croc reached out to remove his left forearm. Fortunately, the limb was successfully reattached (vascular surgery and bone grafting have come a long way). This ruined Chang's day, but considering how fast crocodiles can run, this could have been a lot worse.

So the reptile was too drugged to run, but not too tipsy to rip an arm off. Lesson learned.