I believe this one (reported by Arctic Blast at the Wargamer.com forum) is rather cool!!
Originally published at FIDGIT website.
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http://fidgit.com/archives/2010/04/when_all_else_fails_civilizati.php
When all else fails, Civilization 5 resorts to Extreme Diplomacy
Civilization V will include a novel solution to long drawn-out endgames that have made the series such a chore to play.[INDENT]Should normal diplomacy or military might fail to resolve conflicts between empires, Extreme Diplomacy would allow two world leaders to enter a death match and fight to the finish, using special attacks and finishing moves. Two world leaders enter; one world leader leaves. The victor will obtain complete control of the challenger's world empire. [/INDENT]First they dumb down Civilization for console systems in Civilization: Revolutions, and now this? Sid Meier must be rolling over in his grave.