The lights are on
My dad as far as I know had never played a video game in his life and I had so much fun with the Stanley Parable I wanted him to experience it. So without telling him anything about it I brought him in and I controlled the game (there is no way he'd be able to play without it) and I told him just to tell me everything he wanted me to do. It was a blast, I think he got through about 4-5 endings.
Then I showed him a few of the other possibilities of things he could of done. He didn't even know games like this existed.