I first came across this fic a couple years ago, but I keep forgetting about it - then stumbling across it randomly, and finding myself (once more) in awe.
If you haven't read it, do so; if you have, it's very much worth a re-read.
Title:
In Snape's KitchenAuthor:
Not Exactly DickensWords: 7,698
It's certainly the funniest Severus Snape-orientated fanfic, and undoubtedly one of the best.
And it's a complete parody of every post-HBP Snape-centric fanfic ever.