Go ahead and make fun of me, but I swear on all that is true, I was visited by one of those blue spheres many years ago. I also had a witness who to this day will corroborate. Lost time, high strangeness all of it. BUT most important part, as a child, I was not afraid and never have been. There was no probing or anything weird like that. It was indoors too. When we became aware again we were in another part of the house, sitting quietly about 2-3 hours later.
The one I saw was about the size of a basketball and it moved very slowly through the air.