At a family reunion, we had a nice little place to stay with a hottub. So my cousins and I are in the hottub and we have the heat pretty low since it's hot outside. And our youngest cousin decides he would like to hold his breath underwater, but since none of us are wearing watches (naturally, we ARE in a hottub), we'll have to count for him. So we say sure, okay. Our cousin goes under the water. Stays down there for a good 30 seconds or more. When he comes back up and asks, 'How long was I under for?', my second oldest cousin says, "1 Second."
He was stunned and argued that no it was NOT just one second! So we convinced him that time passes differently underwater. What seems like a long time to him while he's underwater is only a few seconds to us above the water.
To this he sat still for a while, then said, "Okay." And tried again.
A childhood belief about i'm different

others believed things like this
- i used to believe that pools had underwater doors that sharks were going to swim out of.— marky
- I used to believe eating fish enables me to live underwater and eating veggy makes me prettier!— Melody
- My cousin's mom told my cousin that pop makes you short. He probably believed it.— Molly
- I used to believe if you stayed in water too long your skin would get really wrinkled and stay that way.Anon
- When I was little i thought that seconds were so fast that you couldn't count them.— Baby
- I used to think a second cousin meant a cousin’s cousin.— Carlos Almonacid