I used to believe that the popping and thumping sounds of the heat-pipes expanding was little fire-demons climbing up the pipes! I used to put heavy objects over the heat registers to keep the monsters from getting out!
A childhood belief about monsters

others believed things like this
- I used to believe that the heat from the furnace came from hell, and that it was a straight drop there.Anon
- I used to think what heated the food in the pan was the boiling water, not the heat under it.— Mario
- 'I've got candy in my ears tonight, baby'.
~Canned Heat, Jimiroquai.— Nin - I thought that cold was an actual, positive force and not just the absence of heat— terberous
- When I was about 4 or 5, I used to believe that instead of bones, we had metal pipes. — TL
- I used to believe that car exhaust pipes were what propelled cars, instead of the engines.— Thomas Johnston