The Billy Goat Tavern has easily achieved more notoriety than any burger joint in Chicago history.  Originally opened in the shadow of the old Chicago Stadium by the eccentric William (Billy) Sianis in either 1934 or 1937, it gained its first blast of publicity in 1944, when Billy hung a sign saying "No Republicans Allowed" during the Republican National Convention.  The following year, the Billy Goat Tavern became indelibly and supernaturally entangled in the city's sports history.  Before the fourth game of the 1945 World Series, with the Cubs leading the Detroit Tigers two games to one, Sianis attempted to bring his pet billy goat into Wrigley Field, but was turned away, allegedly by William Wrigley himself and allegedly because the goat smelled.  Sianis, angry and upset, retaliated by purporting to place a curse on the Cubs, vowing that they would never again return to the World Series.  The hapless northsiders went on to lose the 1945 affair and, ostensibly because of the "Curse of the Billy Goat," have not returned since, despite being painfully close on a number of occasions.  Some observers of paranormal activity insist that the curse reared its ugly head in the form of a black cat tiptoeing past Hall-Of-Famer Ron Santo at Shea Stadium shortly before the Cubs blew a monumental first-place lead during the 1969 season.  Other mediums of the supernatural claim that the curse caused a routine ground ball to pass unobstructed through Leon Durham's legs in the 1984 National League Championship Series.  Still other psychic observers assert that the curse reappeared in the form of Steve Bartman in 2003.  The Billy Goat Tavern relocated to its current location on the lower level of Michigan Avenue in 1964 and soon became a favorite lunching spot for journalists at the Chicago Tribune and the Chicago Sun-Times, most notably Mike Royko.  Bill Murray, a frequent diner, made the Billy Goat Tavern the subject of a famous Saturday Night Live sketch in which the proprietors famously replied, "No Coke.  Pepsi."  (Or "No Fries.  Chips.")  Today, there are several additional BIlly Goat locations around the city, and it's "No Pepsi.  Coke."