You know what I love about my job? Does BBCode include a rant tag?
Let's say, just hypothetically, that you're the new SEO Manager at a company that hasn't bothered with real SEO in many years. Sure, they outsourced to a few consultants and agencies over the years, and that led to them creating labyrinths of spammy pages, hidden text, crazy spammy CSS classes with names like "SEO" so you know what their excuse was for doing what they did, etc. etc., but for the most part SEO (even terrible SEO) hasn't even been a consideration most of the time.
Consequently, you find that you've got sites with a lot of pages with duplicate titles. A lot of them. Enough that exporting a list of them from Webmaster Tools isn't sufficient, because it will only give you "30 of 50" or "30 of 205." So what do you do? You go to Google and run a search like [intitle:"the phrase in all those titles" site:www.domain.com]. And you get 760 results. And that's not 760 results of pages with titles of "the phrase in all those titles," because Google has been kind and considerate enough to "fix" those titles when they appear in the SERP, so they're mostly something that's actually relevant to the content on the page, followed by "the phrase in all those titles."
So while you know that plenty of these pages actually have a title that consists of "the phrase in all those titles" and nothing else, some of them are bound to be pages with titles that contain "the phrase in all those titles" along with something else, but you have no way of identifying which of them are which without clicking through to each... and... every... one... of... them.