Once upon a time, a scorpion sat by a river shallow wanting to get
to the other side. Some time later, a dog walked past and, seeing
the scorpion's problem said "I am about to cross the river, would
you like a ride across on my back?". The scorpion accepted gladly
and half way across the river, stung and fatally injured the dog.
As they both sank into the water, the dog asked: "Why did you sting
me, now we will both die?". "I am a scorpion", the scorpion replied,
"It is in my nature".