The Travel Tales of Mr. Joseph Jorkens is a collection of fantasy short stories by writer Lord Dunsany.
They usually open with another member mentioning an interesting experience he has had; this rouses Jorkens, who in return for a whisky-and-soda (merely to "moisten his throat," you understand!)
His stories often tip well over the boundaries of the plausible, into the realms of fantasy, horror, or even science fiction, and his auditors can never be quite sure what proportion of what he relates was truly experienced and to what degree he might have embellished.
Typically, the club tale features one particular raconteur notorious for his colorful history and unbelievable reminiscences, who relates memoirs of his life to initially incredulous fellow club members; by the end of the story the latter are usually at least half taken in by the unlikely tale, and count the expense well worth it.
The format has proven endlessly adaptable, with notable instances to be found in the science fiction (Clarke and Robinson) and mystery (Asimov) genres as well as fantasy.