you

This video came to me by my friend's forward. This reminded me of an incident which happened 55 years back. I remember well that during our stay as students at Central College, Begaluru, a science exhibition was arranged. It was visited and appreciated well by citizens. In the zoology section an exhibit was curious. It was a small closed enclosure and the caption was something like ( now I am not very sure as it happened long back) rare animal or curious animal. Every visitor to the cabin would walk out with a smile. Can you guess the animal.

It is you as there was only a mirror inside.