When I was a kid I used to believe that you could write with a pen for ever and ever. I didn't know that there was an ink filled tube inside. One time a pen ran out on me but I didn't know it - I thought it was broken somehow - and I tried for hours and hours to get it to work and got really mad when it wouldn't. I don't know how many years later I found out that there were actual inner workings to a pen and I still remember thinking at that time "Hmmmmm, I guess that pen years ago just ran out on me!!" and felt pretty stoopid after that. lol
A childhood belief about around the house

others believed things like this
- In kindergarden my friend told me that there were 24 hours in the day and 15 hours in the night.— Cari
- I used to believe that every country in the world had the same time. Guess I didn't consider time zones eh?— what are time zones again
- i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- I thought that days had 100 hours in them. Very surprised to hear there were only 24.— Cassiopeia
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis
- i used to believe you slept for 100 hours every night.— skye-ness