Every day of their holiday

Every day of their holiday, these two guys rented a boat and fished. One day they caught thirty fish.

JAMES  said, "PETER, mark this spot so that we can come back here tomorrow."

The next day when they were driving to rent  the boat, JAMES asked, "PETER, did you mark that spot?"

PETER replied, "Yep. I painted a big X on the bottom of the boat!"

JAMES growled. "You old fool! What if we don't get the same boat today?"