Lion released into the wild remembers the people who raised him.

This is really kind of cool. A little cheesy, but cool.

Crooks and Liars » What an unbelievable story: Christian, A true Lion King:

"...A couple raised a lion cub in the UK and eventually he got too big to handle so they brought Christian back to Africa. A year later they visited him even though there was a great chance that he would have—forgotten them—and not been very kind since he lived in the wild and all, but surprisingly he remembered them. The affection he showed was pretty remarkable."