Originally Posted by Tkeyjw
Actually, there's an event more recent example: Guy Pearce in The Hurt Locker (2009) and The King's Speech (2010).
Also, if this counts, Julie Andrews in My Fair Lady (1964) [she provided the singing voice for Audrey Hepburn] and The Sound of Music (1965).
Christopher Walken in Annie Hall (1977) and The Deer Hunter (1978).
haha right on... so I was just way off in my assumption Goodman was the first!!