Mostly because the site involved is a google search home page. I thought it would be interesting to look at this search result anomaly because the on-page content barely exists - limiting most of that side of the ranking factors, and that makes analysis a bit easier.
Also it's less likely that anyone is trying to game the thread to help themselves or hurt their competition. I do personally study search anomalies that I come across, but the amount of potential gaming that would go on if we allowed such posts as a regular practice here would be destructive.
I didn't want to de-rail this thread into some big side conversation - sorry about that.
Earlier internetheaven mentioned seeing the SERPs change with each page refresh. Tonight I saw the Suggestions change as I typed and backspaced my query. The very same letters in the search box triggered different suggestions at different times. Could be related?