What is the most interesting animal you have seen in the wild?

A koala that wandered into my front yard, dazed with heat and dehydrated. I offered him water in the dog's dish (set the dish down and backed away), it took a drink then scarpered up a tree.

Bats. I can't identify their different species but find them fascinating little animals.

A skunk. I was working in an old shed, sitting down sorting through looking for a particular mold.  And I looked up and about 5ft in front of me was a little skunk waddling along.  Just froze thinking, please don't spray me.   
It just kept on his merry way and waddled on out.