Two friends fished in a lake everyday using a rented boat.
One day they caught 30 fishes. One of them said to his companion, “Mark this spot so that we can come back here again tomorrow.”
The next day, when they were heading to rent the boat, the same person asked his companion, “Did you mark that spot?”
His companion answered, “Definitely, I put a big ‘X’ on the bottom of the boat.”
The first one said, “You stupid fool! What if we don’t get that same boat today?