i'm guessing that the overlap between kids who like this comic and kids who like this is pretty huge. [link should be working now, if not, google "proof that girls are evil"]
I might write more about this comic later but quite frankly, i don't think i need to.
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update: Some relevant links: a PvP parody of this comic that is perhaps the first PvP i've ever enjoyed; and a good comment from Bill about having seen this idea before [I was actually thinking to myself that the one place I know of where the alt-text idea works really is trig identities, because the questions you'd get on a test are not What is the Answer To This Problem but How Can You Make This Thing Look Like That Thing]