What do a well, a jack-in-the-box and a hurdy-gurdy have in common?

A censored joke about a "W.C." (water closet) led which host to walk off his show on February 11, 1960? In some Arthurian tales, which sword did young Arthur pull from a stone? In which 1984 film does a weary Daniel LaRusso hear "Get him a body bag" before winning with a crane kick? A weekend party at a mansion turns deadly in which author's 1925 novel "The Secret of Chimneys"? Which armored mammal's name is Spanish for "little armored one"? Which part of the U.S. Constitution begins "A well regulated Militia, being necessary to the security of a free State"? Which Welsh dog breed has a fox-like head and short legs? A were-beaver turns up in Thomas Pynchon's 1997 novel about which famous pair of surveyors?