The Kid and Mr Piggy went into the Perlemoen business.

So for two weeks they dived, sold perlemoen and drank.  It was a hectic existence.  One day at the Underwater Bar The Kid said he felt lus for oysters.

"Right" said Mr. Piggy, "we go to the Porri Fish Shop, they got 'em live there, and we can swop 'em for some perlies".

So The Kid and Mr. Piggy arrive at the Porries, much the worse for wear and negotiate for the oysters.  Swapping them for perlies was not a problem.  The problem was the porries didn't have any live oysters, only frozen.

"Nope we gotta have 'em live" says the kid, "the frozen ones aren't good enough, very fussy with our sea food, we are."

The Porra aunty checks these lads out, they have been non-stop drunk for two weeks, above the water and below.

In a scene reminiscent of the Parrot Sketch from Monty Python she says,

"These have been frozen alive so if you put them back in the sea they come back to life."

The lads considered this news somewhat.

"You sure about this?"

"Yah, sure that's what they do, guaranteed"

So the next scene is our two heroes on the beach with the sack of oysters in the seamaking regular trips to see if the oysters were coming alive.

Until they realised they'd been had.  So they had the oysters.