I was three years old (how come so many of our traumas here happened when we were three?)
A little boy in my neighborhood, who was five or six, was showing off for me by climbing a tree. He managed to make it up onto a pretty high branch. I was impressed!
Then, suddenly, he lost his footing and came crashing down to the ground right in front of my horrified three year old eyes!
I ran to my mom and told her what happened. She got his mom, who took him to the hospital. Turns out, he was alright -- except for a broken leg. But that healed up eventually.
Let's just say, I've always had a devastating effect on men.