Six Thick Thistle Sticks
Notice the sounds
Contrast /s/ with /θ/ while keeping the /ks/ ending of six. Thistle starts with /θ/ and has a silent written t; sticks starts with /st/.
Words in this expression
Source
Delight and Power in Speech, Leonard G. Nattkemper and George Wharton James (1919), articulation exercisesPublic domain in the United States; the pinned source includes the Project Gutenberg license.