I said to Luke when I read that, "You know, Luke, it hasn't happened yet in the story, but I'd already planned out, before I read your post, that when I want to have Harry screw up a conversation with Hermione as badly as possible, I'm going to have him start talking about evolutionary psychology. You literally did that in the way I'd imagined as the worst way possible." (Though the actual chapter didn't come out quite that way when I wrote it - there isn't anything about evolutionary psychology until the very end.)

So I thought of this as a stereotypically male-stupid thing to do, and independently Luke, who happens to be male, went and did it. Can you name a woman who's done the same?