At age 5 - 8 I had animaginary friend called Frank. He was only ever called upon when I was playing solitary games - such as trying to hit a ball against a wall 20 times without it hitting the ground.
Frank and me would have competitions like best of 3, but if I was losing I would change the rules to say best of 5. I would keep on changing the rules until such time as I was the winner.
A childhood belief about imaginary friends

others believed things like this
- I used to belive that the law was a number of rules on a notice board outside Buckingham Palace.— Nathan Vasey
- I used to think that board games were called bored games because you play them when you're bored.Anon
- I used to think volleyball was actually called "ball-y ball"Anon
- i used to believe the sound from a piano came from the keys hitting a stuff called "sploosh"{wierd, huh?}.— exploding buttox
- I used to think that your knee cap was called your knee ball.— Erika
- I was told as a kid that when it thundered, God was playing basket ball. LOL! — Tony