I once had a mule who could figure out how to open almost any gate. He would study it until he could manipulate whatever obstacle we placed in his path. And then he would go walkabout.
I also had a cow who knew how to walk over a cattle guard. Somehow seeing animals outwit us humans tickles me.
Here’s another example, in a video on Petsami.com, a source of non-stop fun for animal lovers. The cat in this video has a technique I’ve never seen before, and it works brilliantly.