How much is a quarter cup of butter?

dug into this following https://news.ycombinator.com/item?id=8430412

what I find fascinating here is that this query appears to show a "knowledge box" result based purely on the content of some site (the answer is a direct quote of the allrecipes page referenced) which leads to the question: can this be gamed? As in, can pages be created with content that leads google to believe it holds the answer to some question posed in natural language? It's interesting that the page quoted also contains a more appropriate response: "1/4 cup of butter = 57 g" but this is not used for some reason (perhaps simply because it comes further down in the page flow?). Even more interesting that a more specific search for "how much is a quarter cup of butter in grams" does not yield a knowledge box result, but rather gives the quoted page as the top search result.

Does anyone have examples of Google providing knowledge box results that are clearly the result of someone attempting to trick google into treating some snippet as a knowledge fact when it isn't?