I was peobably between 8 and 10 years old. I was looking from side to side to cross a very lightly trafficated street mostly for bikes. Suddenly this motor cyclist came out of nowhere and crashed right in front of me. He hit his head on the curb. 
I didn't think about it for many years until I was an adult and it suddenly hit me that he ws probably trying to avoid me. That's why he crashed. I'm not a 100 % sure. This disturbs me a lot though. I feel guilty. I dont know what happend to the man. I remember the ambulance coming and I remember going back and looking at the curb seeing his blood still there. 
It haunts me still more than 20 years after.