When I was about 8 I mentioned to to my mother that the Rolling Stones song 'I can't get no satisfaction' was grammatically incorrect and that it should be 'I can't get any satisfaction'.
She explained that they were using poetic licence.
For years I thought there was a special government office where you could apply for a special licence to use incorrect grammar.
I also thought this applied to using the numeral 4 instead of the word 'for' on a 'for sale' sign.
A childhood belief about speaking

others believed things like this
- i used to believe the rolling stones wrote rolling stone magazine.Anon
- I was sure that Led Zeppelin was the lead singer of the Rolling Stones.— dave
- I used to wonder why people didn't use his first name when they spoke of McJagger of the Rolling Stones.— silly me
- i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!
- When I saw signs stating "Lots for sale" I thought it meant that there was a lot for sale.— Robin
- i thought the for sale sign buy owner things meant that u could also buy the owner — brandi