I have learnt the hard way. I feel like someone who has spent 6 hours being slapped with a wet fish. Probably a king-sized haddock.
Err, could somebody explain this joke? I don’t get it 
sigh “plaice” is a kind of fish.
Thanks, matt_mcl. I guess it doesn’t work too well written out, especially if you’ve never heard that word before.
Plus, I think this is one of those jokes to which Steve Martin has referred in which you have to be a member of that profession, study, hobby, etc to get the joke.
… and then the plumber said “NO - I said bring me a coupling !!!”
LOL LOL LOL 
LOL LOL
Go figure, you just (sort of) named the fish I was going to suggest.
See around here, you’ll often see fish sellers with signs advertising smoked kiaks (pronounced the same as ‘kayak’, hence the origin of my signature)
The delivery is a bit off, too.
Usually it goes like this:
“What are three kinds of fish that begin and end with ‘k’?”
“Uh, I dunno. What are they?”
“Killer shark, king-size haddock, and Keswick.”
“Uh, but Keswick’s a place!”
“Like I said-- three kinds of fish.”
*Katopescadok[/] is one of them. I have this on good authority.
Translates into English as " Fish that swing big pipe". Go figure.
Now THAT was funny!