Just a bunch of robot vacuums running around

I had a Roomba once. I also had a house and a cat named Snickerz, like the candy bar only not spelled the same. Everything started off pretty good and normal at first. That was, until the Roomba became self aware and developed thought. I remember it just like it was yesterday. It all started when I put up those "artificial wall" thingies. At first Roomba would come up to the arty wall then stop, and turn around and go about his merry way, cleaning up all the dirt in sight. But one day when Roomba approached the arty wall, he just stopped for a few minutes. He'd do this every day for a solid week, each time stopping longer than the previous time. I know now that Roomba was testing the device for weaknesses, ever trying to find a way to get past the arty wall that his programming would not allow him to do. Then one day, I came home from work early and caught Roomba in an area of the house that was beyond the arty wall. He immediately turned around and went back into the allowed zone as if nothing happened. If only I had done something to disable him that day, perhaps, well, perhaps, Snickerz would still be alive today. Instead I decided to make the cleaning zone smaller using the arty walls. That didn't help matters. Roomba seems to have resented me for doing that and took great personal offense. At night when I would sleep, I'd hear the faint sweeping of Roomba, drawing closer, and closer until one night I opened one eye and there was Roomba; past the arty walls and "staring" at me while I lay trembling in my bed. Then as cool as he came into my room that night, he turned and went on his way back to his charging station. I wasn't sure what to do. While I got ready for work the next morning I heard a loud screech from Snickerz. I ran into the hallway at the top of the steps only to find Snickerz at the bottom landing, laying motionless. Snickerz had slipped on some marbles. Marbles that I fear were meant for me. I can't prove it but I know that Roomba must have vacuumed up my toy marbles and dropped them at the top of the steps. Perhaps this was his revenge for me shrinking his cleaning zone. I went for my shot gun! There was no way I was going to let Snickerz die in vain! But before I could load the gun the smoke alarms went off. I can only deduce that Roomba short circuited his charging station so that the house would catch on fire. I had to evacuate or else I too would be dead. Needless to say the whole house went up in flames, burning all the evidence of Roomba's mischief and the murder of Snickerz. The firemen searched and searched but there was no remains of Roomba's casing. He must have escaped before the flames engulfed the house. To this day, I don't know where Roomba went...but sometimes, late at night when I'm drifting off to sleep in my new home (the empty cardboard box that Roomba came in); I swear I can hear sweeping noises.