What ironclad memories from childhood have turned out to be pretty much wrong?

This thread of mine from the dawn of this board. This memory was just as clear to me as I described in the OP. I was just wrong.

Also, I had a very distinct memory of going to see my grandfather in the hospital not long before he died, one of the few memories I had of him. I was in 5th grade at the time. Some time back, I finally found his *obit. Nope. He died when I was in 2nd grade.

*The name I knew him by was not one of his given names, and it took a while before I could eventually ferret it out, as there was no longer anyone around who could have answered that question.