I'm looking for an old time travel fic where Harry, Luna, Draco and I think Nevill time travelled to year one. It's crack fic and they get sorted into Slytherin along with Hermione, and their room is called the Looney Bin or smth like that. They scare the hell out of the 1st year Slytherin and one thing I remember is that they shrink the troll saying that it's one of Luna's creatures... Don't remember much, but I think I've read it 7 years ago, and it was abandoned and incomplete at the time...