Scorpion wants to get across a stream. It asks the frog for help. The frog says no, cause the scorpion'll sting it. Scorpion says it won't cause then they'd both drown. Frog thinks about it, agrees, and lets the scorpion ride it's back across the stream. Half-way across the scorpion fucking stings it. As they go down, the frog asks why. Scorpion says 'it's in my nature.'

That fucker already caused harm. For no reason then it was 'in his fucking nature'. He don't get another chance so shut up about it.