Possible opening as Ravenclaw ghost - casting filk

[Martin Smith]

Hi everybody!

During my second screening I noticed, in the scene near the end where the
trio asks McGonnagal where to find Dumbledore, that McG is sitting in front
of an almost empty classroom, overlooking what seems to be a ghost,
suspiciously looking like The Grey Lady, taking an exam.
Popular beliefs claim that ghosts are ghosts because they have unsettled
business, so here's my theory:
TGL (the Grey Lady) had some serious difficulties passing the final
transfiguration exam in life, and died unhappily without having graduated
from Hogwarts. This is her unsettled business, and until she has passed that
exam, she remains in ghosthood. Every year she gets another shot, and JKR
has in mind that she eventually will succeed (maybe TGL passed the exam at
the end of GoF, who knows?), which maybe is foreshadowed in this scene. When
she does, there will be an opening as Ravenclaw ghost, and I hereby present
my candidate for that position: Moaning Myrtle. IMHO, she has the brains to
be a Ravenclaw alumnus (she did solve the Golden Egg riddle in GoF, for
instance).
Please nitpick any part of this theory. I am a Swede, so I can handle it.

Someone suggested the following casting:
Sir Cadogan - Eric Idle. I agree with whoever suggested him. Hilarious!
http://us.imdb.com/Name?Idle,+Eric
I have to write a spirit-of-the-moment filk!

<minor filk>
Bravely bold sir Cad'gan kept watch on Gryffindor
He was not afraid to die, oh brave Sir Cad'gan
He was not at all afraid to be slashed by Sirius Black
Brave brave brave brave Sir Cad'gan
He was not in the least bit scared to be shred to confetti
Or to have his frame burnt up or his paint all dried out
To have his horsie stealed and his sword deep in the mud
Brave brave brave brave Sir Cad'gan
His armour rusty, his hair a mess, his...
Sir C: That's... that's enough singing for now, Martin!
</minor filk>

Martin, disappointed that Ron's hilarious line "She needs to sort out her
priorities!" in the Swedish translation is something like "Should that be
worse than dying?", founder and president and apparently sole member of
W.E.I.G.H.T.L.E.S.S. (Watson, Emma, *Is* Granger, Hermione. Tell Literally
Everyone She's Super!)