Snape in a Dress
One of the most popular pictures in my DeviantArt Gallery. Located here=> http://onii-chan379.deviantart.com/art/Snape-In-A-Dress-116548571
Its the scene from "Harry Potter and the Prisoner of Azkaban". Neville faces a boggert. His worst fear is Professor Snape. Professor Lupin instructs Neville to picture Snape in his grandmother's Sunday dress.
Edit: There is a chicken there because I was reading the book at the time I made this. I added the reference on a whim.