The idea is you go to page 77 of your MS, 7 lines down, then copy/paste the next 7 lines as they appear. Here they are for Air Pirates:
"You have my stone."
Sam knelt beside him, picking at the cobblestones with a knife that seemed to come from nowhere. "I do have the stone, aye."
"I . . ." Hagai sat up straight. "I want it back."
"Nay." Sam looked at him with those piercing blue eyes. He would see right through Tobin's charade, Hagai was sure. Suddenly he was afraid he wouldn't be able to play it through.
Well, not suddenly. He thought it was a bad idea from the start.
I'm not going to tag anybody else except for all of you who are reading this. So, you know, if you want to play, go ahead and play.
And here's a bonus excerpt, because Air Pirates is kinda sorta really polished, and the meme is more about drafts, I think. So from my mid-revision WIP, currently titled Post-Apocalyptic Dragon-Riding Ninjas (with Mechs!):
On either side of the iron doors towered two giant mekas—stone replicas of the metal monsters that helped destroy the Old World.
They had a long ride ahead of them yet. The wall enclosed an entire town over two square kilometers in area, and the road to the central keep was a winding maze to hinder invaders. Domino had plenty of time to figure out what he would say.
"What does the baron have against you?" Ko asked.
"I guess we'll find out."
So yeah, you got dropped into the middle of my world-famous weak description. That's what happens with these memes, I guess.
If you play on your own blog, drop a link in the comments so I can read it too.