The "why are firetrucks red?" one is really interesting as the page result itself is great, but Google is pulling the wrong snippet of the page to feature as the answer.
And for those outside of the US (like me) who don't get this result even if they try to go to google.com: https://www.google.com/ncr (No Country Redirect)
You can see from this that google considers text earlier in the page more important.
This page is odd because the false answer is presented first, so google fails to see it. It could tell that the form of the sentence was an answer to the question, just not that it wasn't the right one
