I flagged this because the link should be changed to this reddit thread, linked in the article: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;AskReddit&#x2F;comments&#x2F;3x004o&#x2F;what_secret_codes_are_all_around_us_that_only&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;AskReddit&#x2F;comments&#x2F;3x004o&#x2F;what_secr...</a>