The objective of this paper is to discuss issues and insights relevant to the ethical behaviour of future autonomous intelligent system merged in the human society. This discussion is done at the frontier of three domains: science, as the mean to imagine and design innovative technological solutions in the field of autonomous artificial systems; law, as the mean to control, forbid and promote what can be used in the human society or not from these technological solutions; and science-fiction, as the imaginary world where scientists and lawyers get consciously or not their inspirations, fears and dreams, driving their decisions and actions in the real world. Four issues are specifically discussed. The crossing of these domains illustrates that addressing ethics in AIS is an urgent need but remains incomplete if addressed from a single discipline or domain point of view.