DS5 genuinely freaked us out by saying "Can I show you this chess opening I invented?" and proceeding to show us not just an opening, but what must be 20+ moves, at lightning speed. He can repeat this feat easily. It is a good opening, though obviously he cannot rely on his opponent to do what he wants him/her to. I have to wonder if the opening is based on/derived from any real openings. This was one of probably 3-5 times in my parenting life when I was literally struck dumb because otherwise I was going to spout obscenities of amazement.