My sister and I once played this trick on my brother. We weighed him on our scale, which was in our upstairs bathroom. Then we told him to go breath the air in the pantry downstairs. While he was down there, we turned this knob on the scale, which made it look like whoever stepped on it, weighed more. So my brother came up and weighed about 20 lbs. more. Then we got him to believe that if he breathed the air in the downstairs bathroom, then he would lose 20 lbs. and simply put the scale back to its normal setting. This went through several rounds before we told him.
A childhood belief about around the house

others believed things like this
- When I was around 4 or 5 I was convinced that you would weigh less if you sucked in your stomach on the scale.— S
- That there was a zombie living behind the bathtub in the upstairs bathroom.Anon
- My mum told my brother that beetroot turned your wee pink. To this day he still won't eat it— Monica
- That blue cheese was made by scraping mould off bathroom walls. My mother actually told me that.— sandee
- Ice cream was made from feathers. My brother told me it was.— ed209
- My brother told me that I would turn into a boy when I got older. It made me cry.— Sarah