The industrial part of my childhood town had a particular large stormwater runoff drain, at least large enough for one car to drive through, and for many years (I think i was 10 when i started questioning the reality of this gem) i honestly believed that if you stood in the drain you would be cloned. Yes cloned. This was 20 years ago so i guess i must have got the idea from Buck Rogers or some early sci fi crap
A childhood belief about physics

others believed things like this
- how many us believed you would go down the drain with the bath water? I did!— Amy
- when i was little i asked what time midnight mass started.
i honestly had no idea.— what time?? - At one time I believed that ZZ Top was an unusually large bustline.— Donna K.
- I used to think a drain pipe in my backyard led to another world.Anon
- i thought that when you were in the bath you would get sucked down the drain— blake
- I used to believe that once you pulled the plug in the bath a shark would swim out of the drain and eat you.— Amy