Once when I was 5 or 6 in my old house my sister and I were in our dining room eating cookies. My sister said that there was an imaginary friend in there named Peter. Every time I looked at "his" cookie, there was another bite missing. For a period of time I thought he was real.
A childhood belief about imaginary friends

others believed things like this
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- My little sister's imaginary friend was Kit the talking car from that show Knight Rider.Anon
- I convinced my sister that chocolate milk was made out of Keebler cookie elves, she believed me for a month— Rainbow Steel
- I thought my imaginary friend was real and he imagined me
I hope he still believes I existAnon - The boy in my class named "Sahand" must have a sister named "Safoot".Anon
- The moon was actually either a sugar cookie or a banana, depending on the time of the month. — Jessica Aspra