Man walks into a fishmonger and asks for Cod.
The fishmonger replies, we have no Cod, how about a nice piece of Haddock?
The man says, hmm sounds nice but how about a piece of Cod?
The fishmonger replies, I've told you we've got no Cod, but we've got lovely Dover Sole.
The man says, i'm not really into the Sole, how about some fresh Cod?
The fishmonger sighs and asks the man to spell Cod to help.
The man obviously replies C - O - D.
The fishmonger smiles and responds there's the problem you've missed the F in your spelling.
The man looks puzzled and says, but there's no F in Cod.
The fishmonger smirks and say's sarcastically well that's what I've been telling you for the last 10 minutes.