In Japan, a man breaks open the wall to renovate his house. Japanese houses normally have a hollow space between the wooden walls, and when when tearing down the walls, he found that there was a lizard stuck there because a nail from outside had been hammered into one of its feet. The man sees this, feels pity, and at the same time is curious because upon checking the nail he realized it had been there since the house was built ten years ago.
The lizard had survived in that position for ten years! In a dark wall partition for 10 years without moving, the man found this to be impossible and mind boggling. Then he wondered how this lizard survived for ten years without moving a single step--since its foot was nailed!
So the man stopped his work and observed the lizard, what it had been doing, and what and how it has been eating. Later, not knowing from where it came, appeared another lizard... with food in its mouth.