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…And then there was that one about the mattress in the “Psycho Tunnels.” Every kid who used to sneak down there had a theory about where it came from: My favorite story holds that it belonged to the weird neighborhood satanist kid, who actually lived there—but only showed up after all the stoners had gone home for the night. A mere legend passed like a joint among Northwest D.C.’s wayward teens—or something more sinister? Local historian Steve Hoglund probably won’t be able to unpack that one, but his brown-bag lecture “Myths and Legends of Washington, D.C.” will enlighten listeners about such local mysteries as why there’s a tidal basin, how Foggy Bottom got its name, and just what is signified by the hoof positioning in equestrian statues. Learn the truth behind that story your neighbor’s cousin’s best friend’s ex-girlfriend told him at noon at the Heurich House, 1307 New Hampshire Ave. NW. $5. For reservations call (202) 785-2068. (Michael Schaffer)