User blog comment:Woganhemlock/Monthly Question - February 2015/@comment-24258073-20150206001021

I've been looking forward to this particular monthly question for quite some time now.

It's funny how you can use the boolprop testingcheatsenabled true cheat, and then shift + click on a Sim, and make them selectable. Make them run into your Sim's house, and make them unselectable. But before that Sim has a chance to leave, your Sim sees them in their house, and they don't go "What are they doing in my house?"

Although indeed, I was using cheats, it still doesn't explain the uncharacteristic response - your Sim not going "What is this Sim doing in my house?" When they see a stranger in their house.