As you might know the Dutch parlement building has somewhat of a garden. They even have a nice pond (also known as the hofvijver) with an little island in the middle.
You also may have heard about how the Dutch government has been increasingly hostile towards cannabis over the past years.
These facts inspired a few creative minds and they decided it was time to plant some cannabis on the above mentioned island using a blowpipe and an abundance of cannabis seeds. :)
Have a look at the video Chris Pieplenbosch put on his youtube channel.