I'm best with SG-1, but if you don't mind badfic, I'm sure I could try my other fandoms as well.
1) Name three fics you think I will never, ever, ever write. In return, I will attempt to write a snippet of one of them.
2) Give me one of my own stories, and a timestamp sometime in the future after the end of the story, or sometime in the past before the story started, and I'll write you at least a hundred words of what happened then, whether it's five minutes before the story started or ten years in the future.
3) Pick one of my stories and I will write a missing scene from that fic.
BTW, go have fun at the comm. Right now, it's very SG-1 centric, but it's open to all fandoms. So come and bring your toys so we can have multi-fandom fun!