In a Jeffery Deaver dead-tree novel about Lincoln Rhyme that I recently finished reading, there were several occurrences of the string in this thread's title.
I've been trying to work out how it came about, and the best I can come up with is:
1) The author used the greengrocer's apostrophe when formulating the plural of pussy ie pussy's
2) An editor subsequently made a global edit to replace single quotes by double quotes (and possibly vice versa).
3) The proofreaders, if any, missed the error.
Any other possibilities?
AJ