Sound of the Drill

Picking up a thread from the Overnight - someone asked Nevergiveup if the sound of the drill didn't bother dentists like it bothers the customers.

My thought was, like the cowboys 'round these parts say about the odor of cowflop - it's the smell of money. Or the sound of, in the dentist's drill case.

(Could use smell: personally, it's that odor of burnt bone when drilling that gets to me.)