I used to babysit for the 7 children who lived next door to us when I was a teenager. The youngest was still in nappies (diapers) and in those days the nappies were really bulky and I mentally invented nappies that were shaped in at the baby's legs (the way they're made now). I remember seeing the ad on tv a few years later for MY nappies and being so annoyed that someone had stolen MY brilliant idea.
I think it's a case of great minds think alike...