I used to believe that 'ten to' (ten minutes until a certain hour/fifty minutes past a certain hour) was actually 10:02 AM. I was surprised that when I asked someone what time it was, it was often '10:02' and never '10:03' or '10:04'.
A childhood belief about general

others believed things like this
- I used to believe that a quarter after the hour was 25 minutes after the hour because 25 cents = a quarter.— Marni
- I thought the big hand was for the hour and the smaller one was for the minutes until i was in third grade.— Time Challenged
- I thought that a quarter hour was 25 minutes long, since a quarter was worth $0.25.— Crystal
- An hour and a half is exactly the same as half an hourAnon
- I used to believe that all songs were exactly a half-hour long.— Brian
- You had to wait an hour after eating ANYTHING, even one M&M, before swimming. Anon