I've heard about these guys on the news, but haven't really seen any pictures that were this ... striking.
I could only imagine being out in the middle of the ocean somewhere and seeing a boat come up with a cannon like that and men with machine guns. I believe I remember one story on the news where a man cooperated, but still had his throat slit. Luckily he lived as they barely missed the main vein.
Even cruise ships aren't safe - or at least from attempts - they tried to board one!