When I was younger I asked my dad:
"If I let go of a balloon, would it float up to heaven or space?"
He replied "It'd pop eventually."
I was hugely disappointed, as I'd already let go of a helium balloon that day with my name and address attached to it, hoping that an angel or astronaut would receive it and I'd get some sort of penpal (I wasn't picky).
Incidentally, it ended up a few streets away.
A childhood belief about physics

others believed things like this
- My sister told me once that if I sucked too much helium out of a balloon, my lungs would explode.Anon
- i usd to believe that if i put a balloon on a lawn chair that i could float up in the sky and around the worldAnon
- When i was young I used to believe if I ate ham fat I was going to inflate like a balloon— a guy
- My older brother used to tell me that if I "untied" it, I'd fly around the room like a balloon. — Gullible youth
- I used to believe that everytime a balloon was released , it meant that a child had recently died.— Samantha
- If you swallowed chewing gum it would make a balloon inside you and your stomach would explodeAnon