Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo

Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo is actually a complete and grammatically correct sentence.

Bison from Buffalo, New York who are intimidated by other bison in their community also happen to intimidate other bison in their community is a quick-ish translation, but if you're still confused, read the wikipedia page.

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See also James while John had had had had had had had had had had had a better effect on the teacher.