That joke is like the Aristocrats insofar as it's an opportunity for improvisation (at as great a length as you can get away with). Also analogously, I've usually heard it as the "'Fuck you, clown' joke" (or just the "clown joke" if you really care about spoilarz).
And in the versions I've heard, the clown calls the guy down to the stage, and asks "Sir, are you a horse's head?" "No." "Are you a horse's leg?" "No." "Are you a horse's tail?" "No." "Well then, it seems to me that you must be a horse's ass!" which is both funnier (to me) and (importantly) longer.
For Draco, you forgot Knowledge: wizard society and Status: Noble and Most Ancient House.
ETA: And Status: Boy-Who-Lived for Harry, of course.
Hermione wears makeup? On a regular basis?! Has this been mentioned before, in MoR or canon? Seems somewhat-to-very out of character to me.
ETA: Eliezer has now removed the reference.
Admittedly the comic seems to assume malevolence rather than the more likely indifference...but it's still a comic about a self-improving superhuman intelligence that destroys humanity.
I was more interested in Quirrell's statement about the note. Have we seen evidence before that the lawyer/genie style of not-technically-lying is particularly relevant in the magical world? Veritaserum, perhaps?
Yes, that's how it should be.