Beyond Belief...

They were driving. How did they see the sparks?

Seriously, when I worked at a service station in the 90s, a lady stopped in and said that her brakes were making a slight noise, and she wanted to get it checked out. I put it on the lift, and popped off the wheel, and the pads were gone, and the rotors were worn down into the fins. I could actually see through the rotors from the side. I have no idea how they hadn't come apart yet. I had no idea how she hadn't heard any noise, or felt strange jerking sensations when she hit the brakes. EVERYTHING on the front brakes had to be replaced. To this day, I still don't know how she didn't get in an accident with the brakes in that condition.