
Revealing mistake: At the beginning of the scene near the end of the movie with Lucius Malfoy fuming at Dumbledore in his office, Malfoy's hair is fanned back behind his shoulders. The lighting in the room illuminates the back of his neck, where you can see his real, short brown hair. (02:22:05)
Answer: It was traveling through the pipes that it could fit into.
raywest
So how was it able to get into the girls restroom and kill Moaning Myrtle many years ago? All of those pipes in the restroom aren't large enough.
The girls' bathroom is the entrance to the chamber of secrets. She was in there when Tom Riddle opened it and let the snake out.
lionhead