And they do not appear in any sort of order or continuity but stop suddenly in the middle of a plot.

Try not to stop suddenly when you are approaching lights or roundabouts and accelerate using as few gears as possible.

When last did a motorcyclists stop suddenly and without warning in front of you?

Harder to fathom was that the llamas would be walking along contentedly, then stop suddenly.

A mechanized heart, which could either stop suddenly, or had the potential to run wild.