When I was younger, I had not ONE imaginary friend, but an entire family. The patriarch of the family was named "Mr. Pickle," and it was almost eerie how real they were to me. There was Mr. Pickle, his wife, and their two children.
There are several accounts of me announcing the Pickle family's presence at our (real) family events. I'd often request that they were given places at the dinner table. On one occasion, my aunt, trying to level with me, pretended to "talk" to Mr. Pickle. After a few minutes of this imaginary conversation, I looked at her, sighed in exasperation, and said, "Karen, who are you talking to? You look crazy. He [Mr. Pickle] went to the bathroom."
A childhood belief about imaginary friends

others believed things like this
- I used to believe a pickle was a smaller version of the cucumber.Anon
- I was about 6 and thought my family invented the fart because I never heard anyone outside my family do it.— Bob
- I used to think that in the song"Family Affair, they were saying "It's a family of bears!"— Wayne Huffman
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- I used to believe that our family was the only family that farted.— Teri
- I thought my imaginary friend was real and he imagined me
I hope he still believes I existAnon