The sixth sick sheik's sixth sheep's sick.1.
2. Rubber baby buggy bumpers.
3. She sells seashells by the seashore.
4. The sinking steamer sunk.
5. Toy boat (repeat 10 times fast).
6. If a three-month truce is a truce in truth, is the truth of a truce in truth a three-month truce?
7. Peter Piper picked a peck of pickled peppers, a peck 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?
8. The skunk sat on a stump; the skunk thunk the stump stunk, but the stump thunk the skunk stunk.
9. Which witch wished which wicked wish?
10. Red leather, yellow leather (repeat 6 times fast).