Led by future Hall of Famers Wayne Gretzky, Mark Messier, Grant Fuhr and Paul Coffey, the Oilers were expected to dispose of the Calgary Flames in "The Battle of Alberta" second-round playoff series. Unexpectedly, the underdog Flames pushed the series to a climactic seventh game. In a stunning misplay, Edmonton defenseman Steve Smith's behind-the-net pass caromed off Fuhr's pads and into the net for what turned out to be the series-winning goal. It's one of the all-time gaffes in NHL history and led to a major playoff upset.