Following a car home who was braking constantly as they were clearly too close to the car in front. I wouldn't care but it wasn't like the car in front was going too slowly (IMO) or that he didn't have he opportunity to overtake (he did!)
One of my absolute pet hates, along with drivers who can't use their indicators and motorcyclists who weave in and out.
Can you tell my journey home was stressful?!