Buffalo?

“Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo” is a grammatically valid sentence in the English language, used as an example of how homonyms and homophones can be used to create complicated linguistic constructs.

It has been discussed in literature since 1972 when the sentence was used by William J. Rapaport, an associate professor at the University at Buffalo.

It was posted to Linguist List by Rapaport in 1992.

It was also featured in Steven Pinker's 1994 book“The Language Instinct”.

Other English words can be used to make grammatical (but not necessarily meaningful) sentences of this form, containing endless consecutive repetitions. Any word that is both an animate plural noun and a transitive verb will work. Other words which can be used in this manner include police, fish, smelt, char, people, can, and bream.

A somewhat similar un-punctuated example is "James while John had had had had had had had had had had had a better effect on the teacher". This could concern a situation in an English class regarding the usage of the word had, and might be punctuated as, "James, while John had had 'had', had had 'had had'; 'had had' had had a better effect on the teacher."