A scorpion unable to cross the river asks a turtle to give him a ride across. The turtle replies "no way you will sting me" and the scorpion replies that it will not because then they would both die crossing the river. The turtle agrees and of course the scorpion does sting the turtle. The turtle laments and asks why the scorpion stung him as they now will both die in the river and scorpion replies, "because it is my nature."
I guess I best not trust everyone.
The Tarot of Durer cards