What was the worst rumour you heard in the playground as a child?
Was it when your friend told you that if you swallowed a watermelon seed, a tree would grow in your tummy?
Or that if you ate all the carrots on your plate you would be able to see in the dark?
Well, there's a whole lot more than that according to Twitter.
#WorstChildhoodRumours is trending on the social media site and so far, over 51,000 people have contributed their own rumours... and they will make you feel all nostalgic.
Here are a few of our favourites.
(FYI they definitely NEVER had a baby.)
... Erm, so did I.
What about you, any childhood rumours you care to add? Or have your children heard any good ones?