It is a warm day. You have been napping for hours, only getting up occasionally to follow the sunny spot and sneer at the furniture. This is your life day in and day out, and it suits you quite well.
You are highly efficient cat, not a lazy cat, however. You take your inspection and pest control duties seriously. So, you are immediately alert when you see a motion from the corner of your eye. A mouse is lurking in the corner of the room.