Let's say you're a movie studio and the insanely profitable series of books you've been adapting for six years is coming to an end - how do you keep the money flowing?

Simple - you start charging people twice to see one story. If reports are to be believed then Warner Bros is keen on chopping the Harry Potter And The Deathly Hallows movie into two separate films, possibly with Steven Spielberg directing.

Halving the last Harry Potter would make sense, because one film could focus on the battle with Voldemort and the other could deal with the part where - spoiler alert - Harry Potter jets to Venus to fight the space piranhas.