Once a scorpion asked a coyote to take him across a fast-flowing river. The coyote at first refused. “You will sting me and I will die.”
The scorpion denied this. “If you were to die then I will drown. I promise all will go well.” So the coyote allowed the scorpion to stand on his head as he braved the waters.
So what happened? … The scorpion stung the coyote who protested. “You gave your word! Now we will both die. Why have you stung me?”
And the scorpion’s reply? “Because, it is in my nature.”
(A modern parallel? “Sequester”)