One young elephant in the children’s zoo was infamous for one very nasty habit. Whenever a new handler was working in the stall she would slowly maneuver around until she managed to pin the person into a corner with her back end. She never pushed hard enough to hurt anyone, just hard enough to keep them trapped.
Then, once she had her victim pinned helplessly, she would raise her tail and let loose with a barrage of elephant farts.
Quite understandably, no one ever fell for this trick more than once. And, of course, human nature being what it is, no one ever warned new keepers beforehand.