It was common "knowledge" where I lived that if you picked dandelions then you would wet the bed.
A childhood belief about plants

others believed things like this
- If you pick Dandelions then you wet your pants. Honestly...I've never tried and I'm not going to test it!— Charlene
- I used to believe that dandelions roared, and butterflies had butter on their wings.— Adam
- I used to believe that dandelions where baby lions and if you trod on one it would bite your foot.— alice
- "The wombles of Wimbledon Common are we" meant that there were loads of them...— Mike
- A common misheard lyric in BMTH’s ‘Shadow Moses’ is “THIS IS SANDPIT TURTLE!”— Oli
- I thought common as muck was a substance called commoners muck— oddsox