We all know that the new Ghostbusters game features vocal performances from stars of the original 1984 film, but did you know that it also features the gravelly stylings of Swedish actor Max von Sydow? Go here to hear him guest as Vigo the Carpathian the seventeenth-century maniac. Vigo, a character from the mostly embarassing Ghostbusters II, was originally played by German heavy Wilhelm von Homburg so there's no real reason for Max von Sydow to be in the game -- besides the fact that he's all kinds of awesome.
This easter egg is super easy to discover, just to the ground floor of the Ghostbusters firehouse and interact with the big painting and bang. You're hearing the voice of Brewmeister Smith, Death and Father Merrin.