one day a scorpion was walking by a river and decided he needs to get to the other bank, however scorpions cannot swim. So he notices a frog sitting in the river. - Hey frog! - he yells, - could you get me to the other bank on your back? - I could do that, - says the frog, - but how do I know you won't sting me? - If I sting you, - the scorpion replies, - you will die and I will drown for I cannot swim. - Alright then, says the frog, - get on my back. So, they are crossing the river and all of a sudden the frog feels the scorpion stinging him. The frog turns his head and asks - why would you do that? And the scorpion replies - I can't help it, it's in my nature.