This was posted by John Vinson (John the Wysard) on alt.callahans. It by his friend Helen.

John the Wysard enters the Bar (having a quick chat with Mark Allread before doing so) and says, “I went to a concert this afternoon with my friend Helen, a new friend named Kitty, and my wife Karen. It was fun.”

“As we left, Helen (a delightful lady in her 70s) told a story…”

“A sea monster was swimming around in the deep ocean when a cargo ship laden with potatoes sank. He saw it coming down and devoured it (in three bites — it was a big ship, but he was a *big* monster).”

“A few days later he perceived another ship laden with potatoes cruising overhead. With his dreadful tentacles he reached up and dragged it down, devouring it as well. The next day a third ship shared the same fate.”

“A fellow creature of the deep asked him, ‘what’s with eating all these ships!?'”

“He replied, ‘Well, you know how it is with potato ships. You can’t eat just one.