The Captain gets on the loud- hailer and shouts, "Ahoy, small craft. Where are you headed?"
One of the Mexicans puts down his oar, stands up, and shouts, "We are invading the United States of America! to reclaim the territory taken by the USA during the 1800's." The entire crew of the destroyer doubled-over in laughter.
When the Captain is finally able to catch his breath, he gets back on the loud-hailer and asks, "Just the four of you?"
The same Mexican stands up again and shouts, "No, we're the last four. The rest are already there!"