The sounds like the old story of when the Bullfrog allowed the Scorpion to hitch a ride across the deep pond, only to sting the Bullfrog as soon as they landed safely on the sandy shores of the water. The Bullfrog says ‘Why did you sting me, after I helped you escsape that flood? You were about to drown!” The Scorpion says, “Yeah, thanks for saving my life, but all along, you knew I was a Scorpion! This is what Scorpions do, we attack weak and vulnerable targets like you!” Thanks for the lift!
Synopsis
A scorpion asks a frog to carry him over a river. The frog is afraid of being stung during the trip, but the scorpion argues that if it stung the frog, the frog would sink and the scorpion would drown. The frog agrees and begins carrying the scorpion, but midway across the river the scorpion does indeed sting the frog, dooming them both.
When asked why, the scorpion points out that this is its nature.
The fable is used to illustrate the position that the natural behaviour of some creatures is inevitable, no matter how they are treated. It is also used to illustrate that individuals are apt to behave in accordance with their true character in spite of the education they might have received throughout their lives and in spite of knowing fully well the right course of action.