The Monk and the Scorpion

This one's from Michael:

As two monks sat beside the ocean they watched as a scorpion fell into the water and began to drown.
The first monk stood up and pulled the scorpion out of the water. As he set the creature on the beach, the scorpion lashed out and stung him.
A short time later, the scorpion fell into the water again.
The first monk stood up once more, but his companion said to him, "Why do you keep saving him? It's in the scorpion's nature to keep stinging you."
The monk replied, "Yes, but it's in my nature to keep saving him."