For such a specific rule, it must have happened before.

I'd wager somebody once gave him a parrot for breakfast.

"Good morning, sir. Your host ordered you a breakfast of eggs over easy and a parrot we've named Lenny, The Open Source Linux Parrot sponsored by Coke®."

I mean obviously, I bet nothing happened before. Who gives someone a parrot?

But he has a short graf on why you shouldn't give him Coke. I had no idea about the "Killer Coke" story. Clearly, he reads up on this stuff; he just wants to share how inhumane the parrot pet trade is, I'd guess.

But still! It's charming in this context.

It may well have happened. I helped organized his talk at Concordia University a few years ago, and this text was slightly different back then. It specified that he'd like to meet a parrot. But that's it. Just was one sentence, giving little information. Given that this is his standard text, I bet someone bought a parrot at one point over the last few years, and that prompted this seemingly peculiar addition.

Yes, he does read up on this stuff. He posts frequent updates here:

http://stallman.org/archives/2011-jul-oct.html

"Once you are done sir, would you allow me the honour of directing you across several of our nearby streets?"

I also thought that this bit was charming:

I start being afraid to express my appreciation of anything, because they would get it and give it to me at any cost. If it is night, and the stars are beautiful, I hesitate to say so, lest my hosts feel obligated to try to get one for me.

"do not buy me a parrot" must be his "no brown M&M's". If he shows up to a gig and finds a parrot there, he knows that not everything is in order.

He would have to have ordered an aviary for that comparison to have worked (people don't give parrots by default).