I used to believe that echos were actually the sound going completely around the world and coming back to you.
A childhood belief about physics

others believed things like this
- I used to believe that the sound of crickets at night was actually coming from the twinkle of the stars.— Lily Fagioli
- I used to believe that "DEAD END: signs meaned it was the end of the world and you would fall off completely— Kristin
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg
- i used to think that if you opened up the back of the telly you`d go into a whole new world Anon
- back in the days i thought the world was black and white like in the pictures— compaq
- I used to believe that if you broke your arm (or whatever) it came completely off.— Jill