At the entrance to the tunnels around Pittsburgh there is a sign that says "Do not cross center line." I used to think that the line ran horizontally across the center of the tunnel and always wondered why cars kept zooming through and crossing that "center line" when the sign told them not to. I still remember my feeling of amazement when it dawned on me that the center line divided the tunnel into two parallel lanes.
A childhood belief about cars

others believed things like this
- I thought you were supposed to drive down the center of the road.— Cassiopeia
- I once thought a vent in my hotel room led down to the center of the earth.— flarn2006
- I used to blieve that the orange center of marshammow easter eggs was Jesus...— Hayley
- I used to think the Senior Center was where all the high school seniors got to hang out and cut class— Jordan
- 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 belive that you drive your car on the line in the street.— abcdef