When I would be in the car with my parents as a really young kid, and I heard them mention "high beams", I thought they were saying "high beans". I pictured yellow string-beans as part of the car headlights!
A childhood belief about cars

others believed things like this
- Until just a few seconds ago, I thought gherkins were beans or something weird like natto...Anon
- I used to think people were called "human beans".— Dave
- I used to call the rays of light from the sun "sun BEANS". That's what it sounded like to me.Anon
- That baked beans were made of pasta! Spaghetti is?!Anon
- My mum used to tell me that baked beans were just peas covered in tomato sauce.— munky
- I used to believe 'three bean salad' was an extremely small entree because it contained only three beans.— queeneve