Tongue twisters

How many tongue twisters do you know? I dare you to repeat this one aloud:

How much wood would a woodchuck chuck, if a woodchuck could chuck wood?
As much wood as a woodchuck would, if a woodchuck could chuck wood.

or an easier one:

Today's the day that they die

How much wood would a woodchuck chuck, if a woodchuck could chuck wood?
As much wood as a woodchuck would, if a woodchuck could chuck wood.

It's crazy!

an other (I'm cheating...):
Thirty-three tridentines came into Trent, all thirty-three trotting.

(or dawdling )

Three Swedish switched witches watch three Swiss Swatch watch switches. Which Swedish switched witch watch which Swiss Swatch watch switch?
Questo con la pronuncia corretta inglese è difficile.

Three Swedish switched witches watch three Swiss Swatch watch switches. Which Swedish switched witch watch which Swiss Swatch watch switch?
Questo con la pronuncia corretta inglese è difficile.

Mi si è srotolata la lingua
Rilancio
She sells seashells on the seashore. The shells she sells are seashells, I'm sure.

One-One was a race horse. Two-Two was one too. When one one won one race, Two-Two won one too.

...funny thread
Not properly a tongue twister (let's remember that Erdős is to be pronounced with a final /-ø:ʃ/, as if it were written Erdösch in German, and English speakers have some difficulties with [ø], though), but I find this amusing:
A conjecture both deep and profound
is whether a circle is round.
But in a paper by Erdős,
written in Kurdish,
a counterexample is found.