Who said robots.txt files had to be boring? Check out the easter egg in YouTube’s robots.txt file:This is what I call “Marketer Bait.”In short, you can create things with the intent to get marketers to promote them, like what I’m doing right now. I saw something interesting and now I’m sharing it. As a result, YouTube gets free earned media and exposure. SEO Bite #7: Always be on the lookout for ways to add easter eggs to your content, website, or code.