Requesting some challenging sentences

I recently picked up an odd grammar that I first
started working on a while back, and made some updates
and modifications to it.

What I'd like to do is test the notion that this
grammar is adequate to express just about any complex
(but reasonable) utterence that can be devised. So I'd
like to ask if anyone has some challenging or
difficult sentences that they have collected for the
purpose of "stress-testing" a grammar to see if it
breaks.

My goofy grammar can be found at
http://fiziwig.com/soaloa.html

--gary

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