I love it when I'm vacuuming and all of a sudden I hear, "Flllpppppppttthhhhhhhh."
You know the sound I'm talking about. The sound of a vacuum taking in chip crumbs, or tidbits of cereal, or whatever else lies around your floor that you may or may not be aware of until that sound is made.
It makes me feel productive. And happy. Because the sound of dust is boring.