Tongue Twisters!

I challenge you to practise some pronunciation with the following tongue twisters!

Peter Piper picked a peck of pickled peppers.Did Peter Piper pick a peck of pickled peppers?If Peter Piper picked a peck of pickled peppers,where's the peck of pickled peppers Peter Piper picked?

She sells sea shells by the sea shore.The shells she sells are surely seashells.So if she sells shells on the seashore,I'm sure she sells seashore shells.

I thought a thought.But the thought I thought wasn't the thoughtI thought I thought.

Say this sharply, say this sweetly,Say this shortly, say this softly.Say this sixteen times in succession.