Two, and often from the same person.
Kelp!
Because he's shellfish!
Pubic transportation
Because he was shellfish.
At the crust station.
You would too if you had crabs on your bottom and oysters in your bed.
A crustacean
I don't lobsters!
Child labor laws forced all the shoe factories to shut down.
They were both two shellfish
Finding crabs on your organ.
A tuna, because the rest of them are crustaceans.
Having crabs on yer organ!
Crabs on your organ.
Swab the deck!
Because he ate too many crabs!
King's Cross Station
They are shellfish.
A crustacean.
Because they are shellfish
Because the SeaWeed..
Because they were both too Shellfish.
A pinch hitter.
You'd roar too if you had crabs on your bottom
Crabs on your organ
He was a little shellfish.
You'd be cranky too if you had crabs on your bottom.
Because they’re shellfish.
He was a little shellfish
Even if it is cold it's still good.
Tomato-saurus
Leave EU.
Aight I'll calcu-lata
His treasures.
Bearied.
On crotches.
For the crotch.
ChinkedIn.
Because it's this answer to every question you ask them. "Did you hear about the President's new policy on... " "I don't even OWN a TV!"
He finishes her drink EDIT: Apparently this is Conan's joke, so all credit goes to him. I just heard it from a friend of mine and I had no idea.