After one year of studying in Wageningen I have just realized one nice custom observed by Dutch people. It is a simple thing that they normally do and which they call a form of politeness.
So from now on if you go through a door just keep in mind not to forget to look behind you and hold the door open for anyone who is following you. Not only for the sake of politeness but also for the safety of someone behind you.
Yuni Kuswanti (from Indonesia) MSc Food Safety