I thought the speed of light was different for fluorescent light since the fluorescent light in our kitchen would take longer to turn on than the incandescent light in our dining room.
A childhood belief about physics

others believed things like this
- I thought if you trip and fall down you fall at the speed of light!— Dietrich Corby
- i believed that if you farted too much in a room and you were to light a flame your house would blow up— the nuclear fart
- In "God Bless America" I thought it was "With the light from a bulb" instead of "from above."— Carol
- When i was little i always thought there were little men inside the traffic lights changing the light— Kiley
- I always thought the song Blinded by the light went "Wrapped up like a dousche, another runner in the night"— Dawn
- I used to believe there was a newsreader inside the radio where the light was!!— Christine