I kind of like the roar of my stove, it has the same effect on me as the bell on Pavlov's dog.
For the car noise why be stuck with motor noises? You could have a recording of the dwarves singing "Hi ho, Hi ho, it's off to work we go" maybe sung by Alvin and the chipmunks!  Or maybe if you were feeling cranky, a recording of the T-Rex from Jurassic Park when he was doing that wonderful roar! Instant cure for constipation in the unwary pedestrian.
Best Wishes, Rob