Did it really happen that way?

I'm was beginning to wonder whether or not anything I remembered from my childhood, actually ever happened. For example: I received a BB gun for Christmas when I was 5 or 6, and I vividly remember walking around our yard "all by myself" with my BB gun shooting birds (not acceptable today). I know I was 6 because we moved off the farm when I was 6 and that's where I remember shooting the BB gun "all by myself".
I was telling this story a while back and my Mom said, "Oh Russell, we did not let you shoot your BB gun all by yourself when you were 6 years old!" I told her I knew for sure I had because I could remember it like it was yesterday. She maintained there was "no way" her and Dad would have let us shoot our BB guns all by ourselves when we were 6 years old.
I began questioning everything I thought I remembered from my early years, when I was struck by the following thought: maybe Mom's the one who doesn't remember. Suddenly, I felt much better about the accuracy of my recall!