(Sam and Sally Spark set off to travel around the world in order to prove it isn't flat - as Sam believes it is!! Sam tells the story...)

We reached the seashore with the sad little donkey and the sadder sunbathers. The sunbathers were sad because the seagulls were using them for target practice. The sea looked flat but I said nothing about that. Instead I said, "How do we get across the ocean?"
"By boat," Sally told me. "The next one leaves at 9 o'clock. What time is it now?"
"I don't know. My watch says it's twenty-five past nineteen. It thinks it's broken."
"Then we'll have to use the ancient shadow-clock trick!" Sally said. "Here's one I made yesterday..." And she showed me.

"It's nine o'clock now!" I said. There at the end of the pier was a very handy boat. There was a sign that said...

We walked along the pier and I looked over the side. "Sally," I said. "There's a man under the pier. He's tied up very tightly with a rope. He's got 'Roger' on the front of his shirt."
"You're imagining it, stupid," Sally said.
I waved at the man. "I'm imagining you!" I cried.
"Mmmmph! Mmmmph! Mmmmph!" he replied.
As we walked along I asked Sally, "Didn't the Titanic sink?" I asked.
She tapped a few keys on her computer.

"Sally!" I squawked. "The Titanic is a wreck!"
"Not this one. This one is probably just named after the great ship."
"But it's an unlucky name."
"Don't be stupid."
"The Titanic sank!"
"Only once!" she argued. "Now get on board!"