Whaaa?! THIS is why the toy egg in a Kinder Surprise is yellow

Kinder Surprise: the one treat you actually don't mind buying your child because there is more toy than chocolate!  

And the fact that the little plastic toy keeps them entertained for at least ten minutes.  

But have you ever wondered why the container inside the egg is yellow? 

No, us neither! 

Just learned the inside of the Kinder Egg is yellow cause its meant to be the yolk…. ah here, its fairly obvious now :O

— James King (@JamesKingRadio) February 28, 2017 

However, it seems some people have, and Twitter is now buzzing with the realisation that it is that colour for a reason.

And the reason?

The little capsule is meant to represent the YOLK in an egg.

I've just realised the surprise inside of a kinder egg is yellow because it's supposed to be the yolk and I feel so smart  pic.twitter.com/mcHZZxpUNI

— Sam Shawcross (@SamJJShawcross) February 27, 2017 

How have I got 2 this age & not discovered the toy case inside kinder egg is yellow cus it's supposed to be yolk. I feel cheated. 

— Gro-Organic C.I.C. (@GroOrganicUK) February 27, 2017

Didn't realise the toy inside a Kinder Egg was was yellow because it is meant to be the yolk?…Rocked my world that

— Josh Hayes (@jhayes119) February 28, 2017

Yup, we had a "oooooh" moment too. 

And while our minds have been blown by this revelation… we are now craving a Kinder Surprise, but the shop's miles away.  

Still baffled that the yellow container in the kinder egg chocolate is the "yolk" of the egg

— James Ayres (@Jamesayress) February 27, 2017

 Us too, Matt. Us too. 

The fact that the kinder egg toy shell is yellow so it looks like a yolk has blown my mind

— Matt (@matt_lakee) February 27, 2017