From time to time you might find yourself wanting to use Chromecast on a tab that you might not otherwise want to show up in your browser history. (Yes, as a warning to parents and a reminder to perverts, Chromecast can beam anything from a browser to the big screen. Anything.)
But in Incognito Mode, extensions are turned off by default. Flipping the switch is easy, and you can do it for individual extensions.
Just type chrome://extensions and you'll be taken to the Extensions page. From there, scroll down until you find "Google Cast," and then click the "Allow in incognito" checkbox. Now it'll work in Incognito mode, and you'll be able to Cast all those ... things .. that you might not want prying eyes to see.