"Jon has a twin sister and Jon and Jon's sister look exactly alike."
"You mean I really don't have a twin sister?" said Jon. "That's a strange thing to write... I expected you'd change me, not change something else outside me."
"I wasn't sure what that would do when I wrote it," said Karyn.
"Hmm," said Jon. "I suppose you're right. That could do a lot of things."
