Tongue-Tied.

Some Doggerel from my Dad for a Dreary, Damp Day:

Here is an old one. I have seen it in several places with no attribution like most of these things from ‘olden’ times.. Try to say it fast.

A skunk sat on a stump.
The stump thought the skunk stunk.
The skunk thought the stump stunk .
What stunk the skunk or the stump?

Here is another better known:

Peter Piper picked a peck of pickled peppers
A pack of pickled peppers Peter Piper picked
If Peter Piper picked a peck of pickled peppers,
Where’s the peck of pickled peppers Peter Piper picked?

***

(Oh, what the heck. Here're a couple of my favorites in French:

Trois gros ras dureront rarement.

As-tu oté ton thé?)