For baseball fans:
I used to think there was a ballplayer named Nicky Sasky. It was later that I learned his actual name was Nick Esasky.
A short time later I heard about a player with a similar name. But this time I figured I had it right because if there was a Nick Esasky it stood to reason that there would also be a Mack Esasser, right? Wrong. Macky Sasser.
A childhood belief about sport

others believed things like this
- My schoolmate Nick used to think that girl's farts smelt of roses.— Nathan
- My mom used to believe that the San Francisco Giants baseball team were actual giants.Anon
- I thought for some reason that chewing tobacco was REQUIRED for Major League Baseball players.— Jeff
- i used to think that ozzy osbourne was a hockey player, and i thought michael jackson was a basketball player.— anastacia beeverhousen
- As a kid every time I heard a person say "it's about time" I always replied "so what about it?"— Eli the Kid
- For the longest time I thought Pig Latin was an actual language that they spoke in a part of Europe.Anon