Police police police police police.
That's a grammatical sentence, and I hate it.
Fucking look at that monstrosity.
I think it's possible to add 'police' a few more times with it continuing to be grammatical, but for the love of fuck, I'm not familiar enough with the definitions and subtleties of the word 'police' to determine what the hell that would mean. Five repetitions makes it a statement on the job description for those who keep an eye on their co-workers, but I think it can be done with eight
It might have shown up in this thread at some point, I don't know.
I read a book once on the weirdness of language, 'Mother Tongue,' by Bill Bryson. Fantastic read.