We used to have a cat that ran into the room, look you straight in the eye, fart and run away. And these farts were the ultra stinky kind, it sounded like a little squeek and the room would stink for at least an hour. One time we had to open a window and leave the room for a while. He did this so often it was 100% on purpose, although to this day I don't know what his purpose would have been. Maybe just to be an asshole, the natural state for all cats.