But they left behind several other (complete) stories!
I just read this one, and adored it. It's short, funny, and creative: Knowledge is Its Own Reward.
"...sorry..." Snape rested on all fours and looked about vaguely, fumbling at his pockets. "......Where’s my wand...?"
"Minerva, Verna and Filius are having a go at restoring it," Dumbledore informed him. "Currently it resembles a rather fancy pretzel."