http://www.globalpost.com/dispatch/news/politics/world-leaders/140310/insult-world-leader-crime-punishment
Dutch law also bans insulting foreign heads of state, provided the Dutch are not at war with the state whose head it is. I don't recall recent convictions, but in the 1930s several communists got locked up for calling Hitler names.
regards,
Hein
So if you were to post on this site that QEII was a rat eating alien who always looked like she was producing a very big turd (for example). The Dutch authorities could be down on you like a ton of bricks.