When, no matter how many people are in your house, you only prepare enough food for 6 at a time.

OMG, I really need to pay more attention I just realized I said "but" I meant "buy".... Darn cold medicine lol

Or when you decide to just but a separate computer for the Sims. I've already decided I'm getting a new one for The Sims 3, lol. Since my bedroom is on 2 circuit breakers I could actually have both running at the same time without problem, lol

You talk about your sims to your friends like they are real people (and realize you have more stories to tell about sims than real people)

You create your friends in your game (to balance out having stories to tell about real people) and call them to tell them about/yell at them for things they're doing in the game.

You get sick and expect to be healthy the next day because you did nothing but lay around all day