Can you imagine an imaginary menagerie keeper keeping an imaginary menagerie?
The sixth sick sheik’s sixth sheep’s sick.
Also, try saying “Peggy Babcock” ten times fast.
There’s a book by William Poundstone called the Ultimate, in which he attempts to find the world’s most difficult tongue twister. The “Leith police” one quoted earlier won second place. First place went to:
The seething sea ceaseth, and thus the seething sea sufficeth us.
Again, not as cool as the dirty ones.
One of my favorites came from a Dr. Katz episode:
Smart she felt, she felt smart.
From The Mikado, of course.
My ex-wife’s choir director in high school used this as a warm-up excercise. She found it sheer torture, as she does most tongue-twisters. Her slight lisp didn’t help matters any.
She also had a hard time (due to the aforementioned lisp) with her role in Gilbert and Sullivan’s Patience, in which she had to use the word “aestheticism” repeatedly.