This post has not been vetted or endorsed by BuzzFeed's editorial staff. BuzzFeed Community is a place where anyone can create a post or quiz. Try making your own!Buzz·Posted on May 29, 2013The Facebook Notification Noise Contains A Hidden MessageWhen is a "ba-doop!" not just a "ba-doop"? When it contains a secret Easter egg.by angrysoupsCommunity ContributorFacebookPinterestTwitterMailLink Recently, Facebook introduced notification sounds. View this video on YouTube Like this one. This is what popularity sounds like in 2013. View this video on YouTube But there's a hidden Easter egg within... Tap to play GIF Tap to play GIF Let us explain. It's actually this chord: the Fmaj7. Four sweet notes, with a light, jazzy feel. Tap to play GIF Tap to play GIF The first note is F. Tap to play GIF Tap to play GIF Via gifrific.com No big deal. Then A. Tap to play GIF Tap to play GIF Via jeremyau.com Better write these down. Then C. Tap to play GIF Tap to play GIF Via tumblr.com OhmygodIthinkIknowhowthisends... Then E. Tap to play GIF Tap to play GIF Via gifatron.com No. Way. Which is to say... Consider our minds very gently blown. Tap to play GIF Tap to play GIF The full story: Facebook's audio designer answers "How much research has gone into developing the Facebook ping sound?" quora.com It's also based on international ring tones — and the doorbell-like sound of someone calling "LASSIE!"