I must have been three. My 5 year old sister was having a birthday party and we were sitting in the backyard. I have no idea what possessed me to do this, but I stripped naked in front of everyone there.
Even then, I was no exhibitionist. It was almost as though my arms were possessed and had no control of removing my clothing articles. I just remember feeling incredibly embarrassed running around naked.
To this day I still have no idea what was going on in my 3 year old head. I mean, it would be one thing to run around naked in front of your family, but in front of complete strangers? Anyway, It never happened again.