Theophilus Thistle is the title of a famous tongue-twister, of which there are multiple versions.
One version reads as: While another version reads: This tongue twister has been included in many tongue twister books and lessons, particularly in helping children and others with speech impediments to correctly pronounce the forward th and s sounds.
In the book Jeeves and the Feudal Spirit by P. G. Wodehouse, the character Bertram Wooster asked Jeeves to repeat a version of the tongue-twister in order to prove that he was not intoxicated: A version of this tongue twister was used in a song called Theophilus Thistler by Australian dance music group Sonic Animation.
This article about British literature is a stub.
You can help Wikipedia by expanding it.