I didn't understand how lie detectors were supposed to work so I thought you could hook someone up and ask something like "does god exist" and you'd be able to get answers to all of life's big mysteries.
I thought there was a left and right sock
I thought wolverines were mythical creatures
I thought if I tried hard enough I could somehow become older than my older brother like it was just a title or something
Thanks to DARE any time I saw a skittle with the S missing I thought it was drugs even in a newly opened package
I wanted an older sibling as a child and I remember trying to convince my parents they should have another baby. In my mind, if I just waited (my age +1) years, I'd then have an older sibling. It never ocurred to me that I would also age during that time...
I was an only child and I just wanted someone cool to play with me who I could look up to. Also all my older cousins picked on me and I wanted defence lol
Your comment about your brother reminds me that in kindergarten I thought that the line order (alphabetical) had something to do with status. My last name starts with C so I was pretty close to the front, but I had a friend with an A for a last name, so I really wanted to move up.
I told no one of this of course until long after I'd grasped how alphabetical ordering worked myself.