[sedatk]

Oh that's awesome. I think I bumped into it once, but my search flow is usually always in a rush that I haven't had time to stop and think about it.

[mastercheif]

You can click the "Quick Answer" button on the search results page to trigger the same feature. I think it appears whenever there is more than one word in the search query.

[paradox460]

You can also force its appearance by sticking a ? at the end of a query, either space separated or otherwise.