03.08.07
Beg Pardon?
The (rather mysteriously) grammatically correct sentence “Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo” has made it into Wikipedia, where you can listen to the spoken article (assuming you have an ogg-compatible player), which may or may not assist you in comprehending the homophonous phrase.
(Thanks to Manuel for the pointer.)

Hell's Donut House said,
March 9, 2007 at 2:48 pm
Curious — not one hour ago I was listening to the Penn Jillette radio show from 9.21.06, and Penn was talking about how he was trying to explain that sentence to the screenwriter of “Ocean’s 13,” and the guy was just not getting it…