Found on the interwebnets

In 1986, Peter Davies was on holiday in Kenya after graduating from
Northwestern University.

On a hike through the bush, he came across a young bull elephant
standing with one leg raised in the air.

The elephant seemed distressed, so Peter approached it very carefully.

He got down on one knee and inspected the elephant's foot and found a
large piece of wood deeply embedded in it.

As carefully and as gently as he could, Peter worked the wood out with
his hunting knife,
after which the elephant gingerly put down its foot.

The elephant turned to face the man, and with a rather curious look on
its face, stared at him for several tense moments.

Peter stood frozen, thinking of nothing else but being trampled.
Eventually the elephant trumpeted loudly, turned, and walked away.

Peter never forgot that elephant or the events of that day.

Twenty years later, Peter was walking through the Chicago Zoo with his
teenaged son.
As they approached the elephant enclosure, one of the creatures turned
and walked over
to near where Peter and his son Cameron were standing. The large bull
elephant stared at Peter, lifted its front foot off the ground, then put
it down. The elephant did that several times, then trumpeted loudly,
all the while staring at the man.

Remembering the encounter in 1986, Peter couldn't help wondering if
this was the same elephant.

Peter summoned up his courage, climbed over the railing and made his way
into the enclosure.
He walked right up to the elephant and stared back in wonder.
The elephant trumpeted again, wrapped its trunk around one of Peter legs
and slammed his stupid ass against the railing, killing him instantly.

Probably wasn't the same elephant