I didn't see this topic anywahere, and if it exists, feel free to delete.
This thread is for the most unexpected plot twists. For example, I'll name a few:
In city of Bones, when the love interest turns out to be the heroine's brother. I was like... well dang.
EDIT(READ):
IF YOU HAVE A SPOLIER, PLEASE PUT IT IN WHITE AND LABEL IT. THAT WAY, IF ONE DOES NOT WANT TO READ IT, THE PROBLEM IS SOLVED.