My nana used to have a plant in her which for some reason or another, she said would punch us if we got too close to it. For years I believed that if I went near a this kind of plant (a leucodendron) the flower head would jump out and take a swing at me.
Just to be safe I kept a respectable distance!
A childhood belief about plants

others believed things like this
- When I was a kid, I used to believe a nuclear plant was a clouds plant and could make magic clouds.— Tommy
- I used to believe that a "punch line" meant a line of people waiting to dip punch from a punch bowl.— Sheila
- I used to think that if I was swinging on a swing fast enough, I could jump off it and start flying.— Nick
- if you eat a seed, the plant will grow in your tummyAnon
- I used to believe that rootbeer was made from the roots of a beer plant.Anon
- I used to believe that if I ate a fruit's seeds, a plant would grow in my stomach.— Natalia Castillejo