Shark and Gudgeon

“Yes, and he’s a shark. He bites. The other is Sam Merton the boxer. Not a bad fellow, Sam, but the Count has used him. Sam’s not a shark. He is a great big silly bull-headed gudgeon. But he is flopping about in my net all the same.”

“I told him that I had a shark and a gudgeon in my net; now I am drawing the net and up they come together.” (Sherlock Holmes)
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