When I'd go on road trips with my parents, every time we'd cross the state line, they'd make the car "bump," like we were going over a speed bump. Until I went on a road trip without my parents when I was a teenager, I thought that there was an actual "line bump" for each state line.
A childhood belief about cars

others believed things like this
- I thought that if you were speeding and hit a speed bump, it would cause your car to fly into the air.— SeñorChaCha
- I use to believe that if you told a story/lie you would get a bump on your tongue.Anon
- On family road trips, my parents always told me that water towers were filled with chocolate.— Edith
- 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 because there was a state called Washington, there was also a state called Dryington.— Jasonchic
- When I was in kindergarten, I thought the last line of "America" was "Great God our kid." — CC