I fell off the dock while fishing. My dad was 20 or 30 yards away. I remember being underwater, I remember the water being stained green a bit, I remember seeing fish I was used to catching (perch), and most importantly, I remember how it feels to be lifted up by your scalp. My dad just grabbed my hair in one hand and lifted me straight up out of the water vertically. You would think it hurts, but it doesn't--at least at the weight of a 3 year old.
The event for sure happened, I'm just not convinced I didn't create a specific memory later--maybe when I was 9 or 10.