Friday funny

From Jokes - and how to tell them, by Sonny Fox (Young Readers Press, 1965):

Jim and Jack were fishing in the lake for the first time. They happened upon a spot where the fish were really biting. "We better mark this spot so we'll know where to come tomorrow," said Jim. The next day they were talking about their hidden cove. "How did you mark the spot, Jim?" asked Jack. "I put an X on the side of the boat." "What a silly thing to do," said Jack. "Suppose we get a different boat?"

Of course, it ought to be Ole and Sven instead of Jim and Jack, in my opinion...