Surprise

Coming home we found a leaflet from the police in our letterbox. First we thought it's part of a general prevention campaign. But having a closer look to it and the reverse-side we realised that it was more personal (see extra). Seems that a police patrol passed in our neighbourhood and ticked off some potential risks of burglary, as an open garage, overcrowded letterbox, etc. 
In our case it was "just" the fact that all was dark.