think we've had enough spoilers, anyone who gets this far probably has figured out the theme of the problem.
Originally Posted by mangler241
This motif must have occurred in some OTB game with a GM, so does anyone here remember one?
Robert Timmer's Startling Castling!
(not the only name this book has been published under) has an impressive 21 examples of this theme, including some games played by GMs and one by Max Euwe. The oldest example is Thornton-Boultbee, 1884: