tongue twister - which is harder?

Was reading through some tongue twister on the web was wondering which is harder... here's a few... Try it yourself... test yourself how far can you go without making any mistakes or getting confused... (do take note of pronunciation and phrasing) Have fun!!! ^^V

first... school basics to get started to warm up...

If two witches were watching two wristwatches,

which witch would watch which wristwatch?

Peter Piper picked a peck of pickled peppers.

How many pecks of pickled peppers did Peter Piper pick?

If Peter Piper picked a peck of pickled peppers,
Where's the peck of pickled peppers Peter Piper picked?

What do you want? Fresh fried fish? Fish fried fresh? Fried fresh fish? Fresh fish fried?

Second...

How much wood would a woodchuck chuck if a woodchuck could chuck wood?
A woodchuck would chuck no wood since a woodchuck can't chuck wood.
But if a woodchuck could chuck wood and if a woodchuck would chuck wood,

how much wood would a woodchuck chuck?
If a woodchuck could chuck wood and if a woodchuck would chuck wood,

should a woodchuck chuck wood?
A woodchuck should chuck wood as long as a woodchuck could chuck wood and as long as a woodchuck would chuck wood.
A woodchuck would chuck as much wood as it could chuck if a woodchuck could chuck wood.

Third

She sells sea shells by the seashore.

The shells she sells are surely seashells.

So if she sells shells on the seashore,

I'm sure she sells seashore shells.

Now try the finale... if you can pronounce this sentence clearly and understandable nothing could trouble you in English. haha...

The sixth sick sheik's sixth sheep's sick.

Now I'm wondering if this was our aural examination in UPSR, PMR, SPM or SPTM or any other English examination... I would say a majority would actually fail... After the last sentence I'm already tongue tied!!! :P LOL