Here's mine:

- You remember seeing an certain episode of the show and then realize that, no, it was a fic or nfic. blush

- You beg a writer to make the story longer or write a sequel, prequel, whatever, because you find their particular Lois and Clark totally believable and/or touching smile

- You're thrilled to see that a specific writer posted to someone else's thread because you hope that means they'll soon be adding a new chapter to their own story goofy

- You've spent hours arguing on the IRC that making a woman a total b***h and a man a total wimp so the reader can see her growth and his patience rewarded is STOOPID and demeaning (and even though the conversation changes to the benefits of various cat food to force you off your soapbox, and get you to leave, you're back on topic within a week)