Have you ever had one of those moments where the penny suddenly drops on a certain topic and you realise that you've been a fool for years?
It more than likely happens to hundreds of thousands of people around the world every day but we are too embarrassed to share it with everyone.
Well, now thanks to a viral twitter thread created by writer Sharon Proudfoot is prompting people to reveal their most ridiculous epiphany moment and it will make you question a lot of things about the human race.
Some people took this a little too seriously and got all profound and intellectual on us.
Some were just ridiculous.
Hands up if you didn't know any of these before reading this?
HT IFL Science