It's their nature

A scorpion wished to cross the river. Along came a frog, and the scorpion said, "Brother frog, will you carry me across this river?" The frog replied, "I do not dare, for you will sting me." "Oh no," said the scorpion, "I will not sting you." And so the frog set off across the river with the scorpion on his back.

Halfway across the river, the scorpion stung the frog. "What have you done?" cried the frog. "Now we both shall die!" "I could not help it," said the scorpion. "It's in my nature."

Nathan Tsukroff