Wow! This elephant obviously does not appreciate a young tourist feeding him and simply clobbers the young guy with its trunk.
Interacting with the elephant did appear safe initially, but look how quickly the pachyderm turned on the unfortunate tourist. Prudence dictates keeping a safe distance from any beast that outweighs you by a few thousand pounds.
This guy will never forget his encounter with an elephant. And you thought elephants had a long memory.