Opening the car door & nearly falling out of the car. My mom tells me I was about 3 but I tell you, I remember it as plain as day.
I was sitting on my mom's lap in the front seat of the car (yes, WAY before car seats like we have now). I was fiddling with the door handle. My mom knew I was BUT she knew the door was also locked (do you remember the old push the button down knob type of thing). Unbeknownst to us, if you happen to open the door handle even with it locked, that door unlocked & opened. My mom figured if the door was locked, it was locked. These parts I don't remember, just my mom telling me that she thought the door couldn't come open being as it was locked. I can guarantee you if she thought for a split second that door could open she would not have let me be fiddling like I was.
I wasn't trying to open the door, just happened to pull on the handle, the door popped open and we happened to be going down a hill. Luckily, residential but I pretty much had my head/body hanging out the door while my mom was holding onto me tightly around the waist until my dad could slow down/stop. To ME, it seemed like we were zooming down that hill pretty fast. I don't remember at all how I got back in the car or what. I'm pretty sure he didn't slam on the brakes because I don't remember that part. I just remember fiddling with the door handle & then hanging out the door with the wind blowing in my face.
My other earliest memory is something that my parents say never happened, so I'm not sure if I just combined stuff or what. It was for what would have been my great-grandmother, I'm convinced that when she died they had her in what appeared to be more like type of baby bassinet bed (I'm sure it was some sort of coffin) but she was in what I am convinced is the living room of their house then. It's not a scary recollection or anything just a it is what it is recollection. There were people there but wasn't as if it was a funeral. When I described it for my parents once, they pretty much thought I was crazy.

Since they said it didn't happen like that at all and they couldn't even remember if I was there. I know I was younger than 3 though, may have been really really little. Therefore, I don't know if I just combined things & maybe I did dream it but it's something that was vivid even now (can't describe it exactly but can see it in my head). I'm not that good to remember dreams THAT many years and that accurately.