A History of the Sentence "Buffalo buffalo buffalo buffalo buffalo." (1999-2015)
Another favorite:If police police police police, who police police police? Police police police police police police.And:James, while John had had "had", had had "had had"; "had had" had had a better effect on the teacher.Also, of course Martin Gardner came up with a great one:Wouldn't the sentence "I want to put a hyphen between the words Fish and And and And and Chips in my Fish-And-Chips sign" have been clearer if quotation marks had been placed before Fish, and between Fish and and, and and and And, and And and and, and and and And, and And and and, and and and Chips, as well as after Chips?