No one boarded that boat without permission… well, almost no one.
On the coast of Argentina, a group of fishermen finished their day and went to sleep without knowing they already had company. The intruder didn’t knock or ask for permission: it slipped straight into the cabin, settled into one of the beds, and got so comfortable that it started snoring as if it paid rent there. The crew members noticed because of the noise. And when they went to see what was happening, they found a sea lion sleeping deeply, belly up, as if it had been reserving that spot for years. Instead of chasing it away, they let it finish its nap in peace.
When it finally woke up, they helped it return to the water, surely with the best sleep hangover of its life.