I used to think that the poster of Margaret Thatcher on the door of the Conservative Party office was in fact the lady that lived there.
A childhood belief about politics

others believed things like this
- I used to believe that my middle name was Goofy, even though it's actually Margaret.— Lisa
- I used to think that Margeret Thatcher was married to Ronald Reagan, because they were always on tv together!— Nat
- I used to think that in public toilets, the cleaning lady actually lived in the supply cupboard.Anon
- I used to think that Chris de burgh song Lady in red was Lady in Bread
— Omega-R-Fox - My Brother used to think that Chris de Burgh was singing 'Lady in bed' instead of lady in red'— Kerry, Manchester
- I used to think the song "dude looks like a lady" by aerosmith was "doodles like a lady"— I used to believe