I used to believe that if you could make a room that was all mirrors then
when you turned off the light the room would still stay lit........
turns out that something like this is the basis for lasers.
A childhood belief about mirrors

others believed things like this
- 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
- when i was little i thought every time i left the room my parents turned into aliensAnon
- I'm scared of mirrors because I think that there are ghosts in mirrors— est
- I used to think that on day light savings time you had to stay up till 2:00am to change the clocks! — Sandy
- I thought that cars could only make turns when you used the turn signals...— Toby
- that the green traffic light turned blue when it was off— Kriket Evens