Harry has entered an international music competition; he consults Dumdedum for repertoire advice.
"Harry, I have a very difficult choral piece for you to conduct" said Dumdedum.
"I hate you! That's so unfair!" said Harry's hormones.
"It is a vital part of any hero's repertoire - you never know when you might need it. It is called 'Deus Ex Machina' - learn it well."
"God used to be a robot?" said Harry, whose Latin left something to be desired. "I can't conduct that. I'll just do all the stuff I learned in first year, that'll always beat everyone!
At the competition, Harry's splendid performance wins tuition from a world-famous conductor, who later turns out to be Baron VoleKiller, or 'He From Whom No Arboreal Rodent Is Safe'. Challenging Harry to a showdown, the Baron flourishes his baton with consummate skill; he is clearly a superb conductor at the height of his powers.
"Hahahaha!" said VoleKiller.
Harry, a pimply teenager who never does his homework, despairs at the hopelessness of VoleKiller's obvious superiority. He then remembers the uncannily useful solution that Q gave him.
"Holy Android!" screams Harry, and successfully conducts 'Deus Ex Machina', a piece he hadn't a hope of conducting correctly when it wasn't a dramatic necessity. The amazing music summons Rowan, who lobs a handful of snot in VoleKiller's face, incapacitating him and thus resolving a hopeless situation with an unstoppable attack of slapstick.
"I told you bogeys were important!" shouts Rowan. "That Deus Ex stuff is well powerful."
"This could be the start of a beautiful friendship..." said Harry.