Here's a sentence for you:
"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo."
It parses. (A bit tautological, but it parses.) See how.
(Resist the urge to click that link until you've tried to figure it out...)
Some confusion appears to have arisen about the example sentence.
Below, I present a simple Venn diagram that will no doubt clear up any misconceptions.
(Diagram drawn using the tool supplied at Crappy Graphs...)