Of course there are the old classic:
"How much wood could a wood-cutter cut if a wood-cutter could cut wood?"
"Polly picked a peck of pickled pepper"
and try this one 3 times:
"I'm not a pheasant-plucker - I'm a pheasant-plucker's son, and I'm only plucking pheasants till the pheasant-plucker comes"
- Whoever said that women are the weaker sex never tried to wrest the bedclothes off one in the middle of the night
- Worry is the interest you pay, in advance, for a loan that you may never need to take out.