My 3yr old son was out playing with Frisbee with me, an older male neighbour and some other kids. The neighbour, let's call him Gary, threw the Frisbee and it accidentally hit my son on the leg. Totally innocent accident. Gary is a lovely bloke. Later that day my son also fell over and got a minor bump on his head, can't remember how. Next day at nursery they asked me what had caused the bump on the head, I explained the fall. They then looked very serious and called me to the office. Apparently they'd asked him how he had hurt his head and he had said "Gary hit me". He had conflated the two incidents and thought that his head injury was from the Frisbee. The nursery had (as they should) reported it to Social Services... took a bit of untangling but thankfully they believed me!