maybe it will be about a family who are being mysteriously controlled as they live there lives. they feel something isnt right as they wake up in the morning with a new frdige and do not why. They hear about this conspiricy called "the sims" and start a long struggling fight with their maker (this can be exapnded to a town ala truman show)
or it could be about a boy who is really evil and keeps killing all his sims, he then gets sucked into the game and is forced to live life as a sim with a big green triangle, learns the error of his ways blah blah blah
or it could be about a geek who is obsessed with the sims, and works out how to control people in real life using the game. and goes on a tyrancal spree and its up to some little girl and her puppy to save the day