Our school has only started doing this since we got a new head a few years ago, and I hate it as much as I thought I would.
I have a Y4 and a Y6 and apparently neither of them are capable of thinking of anything except Harry Potter.
Which they both did last year, and the year before.
Actually DD3 fancies going as a character from a book that has a gun as a prop but I'm pretty sure that would be frowned upon.
Has anyone got any great ideas?