"The coldest winter I ever spent was a summer in San Francisco," "When I feel the urge to exercise, I go lie down until it passes away," "When the end of the world comes, I want to be in Cincinnati because it's always twenty years behind the times," and a number of other sayings that are frequently attributed to Mark Twain cannot be found in any of his works.
They are among the quotes that the Mark Twain Project at the University of California believes have been misattributed to Mark Twain.
