What's really awesome about this is that it doesn't appear to be an easter egg. WA simply interprets this unusual question as being a reference to something it knows about.

I think it has to be an easter egg considering that WA does not provide answers to many "How .... ?" questions. It's much more of a service for "What" questions. But I do like that it's displayed like any other answer. It gives a Watson feeling.

That's way cooler, you're right.