Let's Get It Right, Guys

Today's xkcd has a lot of potential, but it's just not up to snuff. I love the last speech-bubble, but I don't think metaphors are as equivalent to analogies as they're implying and, further, the roll-over is just plain inaccurate. Mr. xkcd does much better with mathematics or science or logic than with language, methinks.

Pedantry now over. You may resume your business.