Like Doc Brown, I once hit my head and saw the future. I didn't come round in the bathroom having the idea for the Flux Capacitor, but I did bonk my noggin pretty hard in the office games room and sit back, dazed but delighted with what had just happened.
I was playing the Budget Cuts demo on Valve's room-scale VR. Budget Cuts is a game about infiltrating an office that's patrolled with deadly robots. Because of the room-scale VR, you're really there: your actual body is your in-game body. This means that the robots are the same size as you - which is terrifying - and it also means that when you have to duck your head through a missing panel in the floor to look into the room below, you really have to do it. Except that while the game floor might be missing a panel, the real floor isn't. Bonk. I did it. Chris Bratt, who had also played the demo, had done it. A day later, so moved by what I'd played I brought in a friend to try it out. They did it too. We all hit our heads and we all saw the future.
More than just the future of video games, I really felt like I had seen the future of one series in particular. I still think this. I still think that Budget Cuts is essentially the closest I've ever gotten to playing Half-Life 3. It's not set in the Half-Life universe, although its mixture of horrific technology and the banal and bureaucratic is not a million miles away. It wasn't made by a Valve team, although I gather the people who made it did end up working on the final game at Valve as incubees. Instead, it channels that magical thing that Half-Life has always done.