Incredible things Germans do when biking

First of all, most of the things here are no recommendable, although pretty awesome, they are also dangerous.
One time a girl biking in front of me on a busy street dropped her purse and we almost had an accident, luckly I always keep a big distance.
After the shock I screamed a bit at her and follow my path.
Yesterday I biked for the first time from my house to the main station of Munich, something around 6 kilometers away, I realized I need to buy me a helmet.
All my daily experience biking made me thing about the following drawing: