Afternoon, broad daylight. Mr shineypants just entered the apartment and took a vacuum XL out of his pocket (let's say it was his pocket, really) and started absorbing the mirror (yes the mirror, apparently the PC wasn't hot enough for him, or the mouse pad with skulls scared him off).
Now I thought I was well prepared for any kind of intruder with my aggressive cat (of which the tooltip read that it would catch any burglar) and my brave granny (of which the tooltip read that she would fight any burglar). However, Lady didn't have any interactions available with the burglar, whereas she usually can at least sniff a person she hasn't met before, and Granny had a moment of instant senility and was just staring at him in disgust, unable to do anything.
A quick search through the internet taught me that this has happened to other people before, and it's probably a bug. Because it was pissing me off, I went back to the latest save game and tried again.
This time it took three whole days before a burglar visited the 11th floor, and it wasn't some shineypants from the next century, but your regular classic burglar. He was called Blake. Blake didn't get past the hallway or Granny ran to him, the two circling around each other (appropriate music) and deeply staring into one another's eyes.
Things became a bit disturbing when the text "Blake thinks Vanessa is okay." turned up, while Granny got a positive moodlet from being "near an attractive Sim". Soon there was nothing to be seen besides a lot of dust and stars in the hallway.
I'm not sure how she did it and if she played it by the rules, but Granny totally won the fight and Blake dived into the elevator to get away. I hope he's going to take some time to rethink his life, because he was just totally owned by a granny like a boss. In her pajamas, that is.
Sadly, no exciting romances were initiated as the fight left a negative affection rate with Vanessa. Perhaps this is a good thing, as a relationship of this kind could prove a bit too adventurous. For Blake, that is.