Google Chrome (and probably other popular browsers) helpfully suggests recently-used strings when you begin typing in a search field. The drop-down suggestion list appears underneath the text box, and allows the user to select one of the items from the list instead of retyping it all over again.
This used to work just as expected, until it was recently decided that the search box should automatically expand its size when the user starts typing in it. Now, since no one has warned the browser that the search box might unpredictably change its size and starting location, the browser dutifully shows the drop-down suggestion list in what it thinks is the correct location, but what is actually the old location of the search box.
To reproduce, simply click in the search box and begin typing—only a single letter is required to automatically invoke the browser functionality. A picture is, as always, worth a thousand words:
Since it's hard to blame the browser for things like this (how is it supposed to know that you're going to move the box right out from under it?), I'm a bit concerned that the response will be to blame the user.
(I'll admit that this question is quite similar to this one, which observes the same behavior in passing, albeit attached to another bug report related to the same expanding search box. The primary bug that was reported has now been fixed and that question has now been deleted. I assume that'll rapidly become the fate of this humble question, but one can still hold out for that small sliver of hope, right?)