"Aah!" He feels this sting! "You stung me! Why did you go and do that?" The scorpion...

[last lines] Dil:
What am I supposed to call you then, Jimmy? Fergus:
Fergus. Dil:
Fergus... Fergus. My love. Light of my life. Fergus:
Please, Dil. Dil:
Can't help it. You're doing time for me. No greater love as the man says. I wish you'd tell me why. Fergus:
As a man said, it's in my nature. Dil:
What's that supposed to mean? Fergus:
Well... there's this scorpion, you see, and he wants to go across a river. Well, he can't swim so he goes to this frog, who naturally enough can swim. And he says, [imitating the scorpion's voice] Fergus:
"Excuse me, Mr. Froggy. I want to go across the river." [continues narrating] Fergus:
So the frog accepts the idea. The scorpion hops on the frog's back. Suddenly, the frog: "Aah!" He feels this sting! "You stung me! Why did you go and do that?" The scorpion looks at him and says, "I can't help it, it's in my nature"