I was involved in a minor motor vehicle accident about two years ago. I'd stopped my car at a wet intersection. I started to pull away once the traffic lights turned green, and at the same time a driver (from the opposing side of the intersection) turned across my path. I planted my foot on brakes as quickly as I could, the car's anti-lock braking system kicked in, but the road was too slippery - I t-boned the other driver's car on their passenger-side door.
Given the relatively low-speed at which I hit the other vehicle, I was somewhat surprised at the impact of the accident, and the amount of damage both vehicles sustained. Fortunately nobody was seriously injured - probably because all involved had been wearing their seat-belts. But, the jolt from the impact made me realise how seriously-hard an immovable object must be when traveling at any speed over 20km/h.