The Curse of the Billy Goat is a sports-related curse that was allegedly placed on the Chicago Cubs Major League Baseball franchise in 1945, when Billy Goat Tavern owner Billy Sianis was asked to leave game 4 of the World Series against the Detroit Tigers at the Cubs' home ballpark of Wrigley Field because the odor of his pet goat (named Murphy) was bothering other fans. He was outraged and allegedly declared, "Them Cubs, they ain't gonna win no more," which has been interpreted to mean that there would never be another World Series game won at Wrigley Field. The Cubs have not won a World Series since 1908, or played in one since 1945.

More Info: en.wikipedia.org