Hmm, I used to make a point of putting the cats in a room where I wasn't vacuuming, but discovered accidently that they will do this for themselves once "Mr. Vroom-vroom" starts up. Livvy seems to actually have moments of daring where she scampers back and forth near the door of the room being vacuumed. I've wondered if this is some variation on 'kitty chicken' game?