Seeing the other lane move faster than your lane.

Having an itch on your ankle/foot.

Needing to sneeze.

Feeling sleepy.

Hearing police sirens in the music you’re listening to.

Seeing a cop car in any capacity.

Driving behind a semi carrying a bunch of stuff that’s barely strapped down.

Having traffic come to a sudden stop but being too far away to see why.

Trying to stop on a tiny patch of ice.

Motorcyclists weaving in between lanes.

Any more to add?