There once was a scorpion, which found itself on the edge of a gushing river, one that no scorpion could ever hope to cross. As it was pondering the situation a frog appeared, and with it, an idea.
“Frog”, asked the scorpion, “will you ferry me across these waters upon your back?”
“That would be madness,” answered the frog. “You are a dangerous scorpion, and I a vulnerable frog. Why would I take such a risk?”
“No risk”, assured the scorpion. “If I sting you, I too will drown.”
And so the frog agreed. Halfway across the river’s width, the frog suddenly felt a spasm of pain.
“Why?” he cried out.
“Because it is my nature”, answered the scorpion.