The bus's number was 13.
This happened to my old man in Taiwan:
He was going to a party, early evening - you could still see the skyline. He was going down this hill and he completely lost his brakes. The car just kept on speeding up downhill.
My dad caught a glimpse of what appeared to be a large shadow, so he assumed it was some large object that could break his speed. He was correct - it was a giant boulder just to the side of the road. He turned towards the boulder, the car flipped several times and finally stopped upside-down, totally crushed (it was a Ford Galaxy, btw).
He broke several metacarpals and was never able to make a fist with his left hand again. He broke a few other bones, but other than that, he was ok. He did take out a motorcyclist in the process, though, although the motorcyclist also eventually made it out alright.
What freaked my father out initially was hearing this guy scream, "My eyes! My eyes!" He thought he ran into someone and took out his eyes. It turned out that the guy was only looking for his eyeglasses (they both sound terribly similar in Chinese).
This all happened exactly one day after his car insurance ran out, and my dad figured "hell, what could possibly happen in one day?"
The date was April 4, 1974. Pretty ominous when you consider the accident happened in Taiwan, and normally buildings in Taiwan do not use the number 4 because the Chinese character for that number sounds very similar to the character meaning "death".
But then again, I've always believed it's bad luck to be superstitious...