1.) Go to my Fanfiction Index Part 1 or Part 2 and pick out a line or two from one of my stories. (Must be a full line, please -- no sentence fragments or speech tags or other such nonsense.)
2.) I will respond with which story of mine I think it's from.
3.) If you stump me, I'm not going to promise a drabble or anything like that because I'm woefully lacking in inspiration. I do, however, give you the right to mock me. Alternatively, if you stump me I'll pick a line from one of your fics and return the favour.
I'm not sure how well I'll do on this; I've a feeling the answer will be "really badly".
Alternatively... copying deird1 this time, if anyone wants to request an Author's Commentary on any of my fics, them just ask and I'll write it. Or link you to the commentary I've already done, if applicable - though if so I might have another look and see if my opinions have changed since I wrote the last one.