When me and my friend were about 6 years old, we decided to go time-travelling. The only way we could work out how to do this was to sit at the top of my stairs in my baby brother's baby bath and wait for my mum to get home from shopping(the front door was right in front of the stairs) and then we would slide down the stairs and right out the front door so quickly we'd have to go back in time. Fortunately we didn't have the patience to sit all squashed up in the tiny little baby bath for longer than about 10 minutes so we gave up on our time-travelling plans and watched tv instead.
A childhood belief about physics

others believed things like this
- I used to think that you could get a tan if you turned the oven on, opened the door and stood in front of it.Anon
- I used to believe that a baby shower was a tiny bathtub with a showerhead just for the baby.— Amy
- I used to believe I could fly when I was about four, until I fell down the stairs.— Sarah
- I used to think you could die if you jumped half way down the stairs. Anon
- I used to believe that if I went down the stairs slowly a red eyed skeleton would come and run after me.— Melly2bee
- I used to believe that it was the law to hold the railing when you're walking down/up stairs— Brit