I always thought 24/7 meant the time period for one day: 24 hours and 7 minutes. This made me wonder what happened to those seven minutes each day on the clock. I figured there were some extra before midnight: 11:58, 11:59, 11:60, 11:61, all the way to 11:66 when it finally changed to 12:00. This surprised me New Years Eve when everyone said, "One minute till midnight!" and I said "No, it's in EIGHT minutes. You forgot the extra seven."
A childhood belief about general

others believed things like this
- 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 used to believe that I would be paralysed if I sat on the floor for more than 20 minutes— bittergrass
- If you eat 30 minutes before swimming, you will sink.Anon
- I used to believe that Andy Rooney, of 60 minutes, was my real father!— KM
- i used to think that you would die if you didn't wait 30 minutes to go into the pool after eating. (^^)— cady
- I used to think "A.M." and "P.M." meant "After Midnight" and "Post Midday".Anon