A lady had reversed into the front of the car, but as much as I want to blame her for all of this I really don't think its her fault. The first time the belt came off the the coolant return hose had broken at the top of the radiator and the hose+metal clamp got caught in the pulley/belt/visofan area, spinning around and presumably knocking into the pulleys. This bent some of the grooves out of shape.

Thanks for the advice Matt. The car broke down again today and while the belt is still on the instrument cluster lit up all at once and the car started to heat up. That makes 8 times in the last ~200 miles. It used to be so reliable too...