REALLY FUCKING HARD TONGUE TWISTERS

I usually try to say at least one of these before giving talks. And I usually try to get friends to say these while they're drinking.
  1. Peggy Babcock (5x fast)
  2. Toy Boat (5x fast)
  3. A box of mixed biscuits (5x fast)
  4. The sixth sick sheik's sixth sheep's sick.
  5. Mrs. Smith's Fish Sauce Shop (5x fast)
  6. Greek Grapes (5x fast)
  7. Irish Wristwatch (5x fast)
  8. Unique New York (5x fast)
  9. Knapsack Straps (5x fast)
  10. One smart fellow; he felt smart. Two smart fellows; they felt smart. Three smart fellows; they all felt smart.
  11. Six stick shifts stuck shut (3x fast)
  12. I slit the sheet, the sheet I slit; and on the slitted sheet I sit. (3x fast)
  13. Mrs Puggy Wuggy has a square cut punt. Not a punt cut square, Just a square cut punt. It's round in the stern and blunt in the front. Mrs Puggy Wuggy has a square cut punt.
  14. Eleven Benevolent Elephants (5x fast)
  15. Free Real Rear Wheel (3x fast)
  16. Red Leather, Yellow Leather (5x fast)
  17. Red Buick, Blue Buick (5x fast)
  18. My Willy's Really Weary (3x fast)
  19. Cracker Barrel (5x fast)
  20. Swiss Miss Mix (3x fast)