I had an imaginary friend who lived in a drain pipe, but that probably isn't so strange; most kids have them at some point. That when I grew up and was an adult, I could do anything, accomplish anything. Also probably not unique or strange, but a hoot.
Probably the unique thing was the belief that all I needed was a typewriter to write better children's books than Dick And Jane. I remember my last spanking, at age 6, was for demanding a typewriter a couple of times too many.