"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo."

Essentially say "People I hate hate other people."

Now describe the people. "Maine people I hate hate other Maine people."

Now I'm not the only one, and I'm from Maine. "Maine people Maine people hate hate Maine people."

Now replace the descriptors with Buffalo (the place as an adjective of position), the people with buffalo (as in herd of), and the action with buffalo (the verb meaning: to bully).

"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo."
wikipedia on this sentence.