Harry Potter and the realisation that farting about with a wand is kind of nancy and it'd be best to become a real man and operate a pneumatic drill whilst reflecting on what might have been with Ron.
It would be an interesting change of direction.
This JKR said but i think it's just a joke with the whole Mark Evan's argument, '....he owns the Mystic Kettle of Nackledirk!' (Possible title of book seven there, must make a note of it).'
But then who knows? It could be
"Harry Potter and the Kettle of Nackledirk"
hmmmmmmmmmmm