I used to see those tags on pillows and mattresses that said "Under penalty of law this tag is only to be removed by the consumer" and I thought it meant you would go to jail if you took off the tag yourself instead of taking it to a place where I imagined a guy with a pair of scissors at a 'Consumer' office cutting them off. My dad nearly fell over laughing when I explained it to him this way after freaking out when I saw him cut the tag off a new pillow.
A childhood belief about around the house

others believed things like this
- I used to think cut and paste meant there were scissors and glue inside the computer!Anon
- I used to think 'To Let' on disused office buildings meant they were big toilets.— Tracey
- I used to think being engaged meant being in jail. I have no idea how I came to that conclusion.— CNB
- I used to think that the tags on cows ears were actually earings.— Kelly
- Someone told me People and fish went to the same place.I thought they meant humans get flushed— MrK
- When I was about 3-5 I thought I could shave like my dad and I ended up cutting myself all over. — Matt