When my boat was built in Canada back in 1985, she wasn't required to have one, so she was launched without it. It wasn't an issue for either of the previous owners, but it became an issue for me when I wanted to finance the boat. I was able to find the agency in New York State that would issue me a new HIN, but they refused to do so until I owned the boat. That was a problem because I couldn't own the boat until the bank gave me moneys, and the bank wouldn't give me any moneys until there was a HIN on the boat.
Something had to give, or the deal was going to fall through. The state absolutely refused to budge, so I begged and pleaded with the bank. I promised them that I had every intention of putting the stupid number on the boat, that I'd already filled out the paperwork and bought the stamps to do it, and invited them to send someone over to hold me at gunpoint until I did.
They caved, I got the number, hammered it into the transom, had the local sheriff and his gun come out to look at it, and that's when Bob became my uncle.