I did that once a long, long time ago with the organization that monitors maritime piracy around the world. They have a mailing list which I accidentally stumbled on that included I assume since I only saw the one page of email addresses that ended in top level domains like un.org and navy.mil thousands of email addresses. I contacted through email the people running the organization that I accidentally stumbled on the page and they should probably hide it which they responded thank you. If you have ever been to Washington DC you would know the amount of money military contractors spend to show the latest navy vessel to everyone at the Foggy Bottom metro station and other places where such ads seem unlikely. That was the mother of all B2B email lists for militaries and shipping companies around the world. I didn't want to play any games with it.

EDIT: Remembering it now, there were also email addresses with the Iranian navy as they coordinate with other navies to fight piracy too. Perhaps instead of sending a Rickroll I could have sent a mass email with Lennon's "Give Peace a Chance."