I think it brings into question 'cause and effect' If we use scientific thinking then we would assume that the reason something happens is because something else caused it to happen. In this experiment it is, apparently, impossible for this to be the case. If you throw a tennis ball in the air it will land somewhere, if, a little while later you throw another ball, it will also land somewhere. What this experiment suggests is that the ball you threw first is somehow determining where the second ball will land even though its just lying on the floor somewhere and has nothing to do with your arm or the second ball