Bisson Jokes

I submit the following. For all I know, it may have originated in
rec.humor.funny, but I don't know. This was sent to me by a friend.
Apparently it has an unknown author.
[Note - Michael subsequently reported that the author is Terry Bisson, it
originally appeared in OMNI Magazine, it was nominated for a Nebula,
and it is reprinted here by permission of Mr. Bisson. My thanks
to Michael and Terry - ed.]
Imagine if you will... the leader of the fifth invader force speaking to
the commander in chief...
"They're made out of meat."
"Meat?"
"Meat. They're made out of meat."
"Meat?"
"There's no doubt about it. We picked several from different parts of
the planet, took them aboard our recon vessels, probed them all the way
through. They're completely meat."
"That's impossible. What about the radio signals? The messages to the
stars."
"They use the radio more...