My 13th.

Some tongue twisters ahead:

Give me the gift of a grip-top sock,
A clip drape shipshape tip top sock.
Not your spinslick slapstick slipshod stock,
But a plastic, elastic grip-top sock.
None of your fantastic slack swap slop
From a slap dash flash cash haberdash shop.
Not a knick knack knitlock knockneed knickerbocker sock
With a mock-shot blob-mottled trick-ticker top clock.
Not a supersheet seersucker rucksack sock,
Not a spot-speckled frog-freckled cheap sheiks sock
Off a hodge-podge moss-blotched scotch-botched block.
Nothing slipshod drip drop flip flop or glip glop
Tip me to a tip top grip top sock.

Peter Piper picked a peck of pickled peppers.
A peck of pickled peppers Peter Piper picked.
If Peter Piper picked a peck of pickled peppers,
Wheres the peck of pickled peppers Peter Piper picked?

Denise sees the fleece,
Denise sees the fleas.
At least Denise could sneeze
and feed and freeze the fleas.
Sinful Caesar sipped his snifter,
seized his knees and sneezed.

Chester chooses chestnuts,
cheddar cheese with chewy chives.
He chews them and he chooses them.
He chooses them and he chews them
Those chestnuts, cheddar cheese
and chives in cheery, charming chunks.

Moses supposes his toeses are roses.
But Moses supposes erroneously.
Moses, he knowses his toeses arent roses
As Moses supposes his toeses to be.

- Singing in the Rain (1952)

I bought a bit of baking powder and baked a batch of biscuits. I brought a big basket of biscuits back to the bakery and baked a basket of big biscuits. Then I took the big basket of biscuits and the basket of big biscuits and mixed the big biscuits with the basket of biscuits that was next to the big basket and put a bunch of biscuits from the basket into a biscuit mixer and brought the basket of biscuits and the box of mixed biscuits and the biscuit mixer to the bakery and opened a tin of sardines.

- Said to be a diction test for would-be radio announcers: To be read clearly, without mistakes, in less than 20 seconds (from Coronet Magazine, August 1948).