I can't tell if that's a practical joke or not... I just can't see how the concept can be adapted into a movie. I suppose they could give it elements of mystery/suspense/horror/surreality, like when the Sims wake up to find that all their toilets have been deleted... or will it be about their gradual awakening, as they realise that they're merely players in someone else's game?
No matter how they approach it, it's sure to be odd. It'll be interesting to see where they go with this.