Hmmm...Spassky vs Fischer, 1972 Game 2? Fischer defaulted, no moves played. ;)
Shortest game ever! (played by GMs)
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Probably this one with SGM (Super Grand Master) Chuck Norris vs. All GMs:
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Bf5 6. Qe2
http://www.chess.com/forum/view/general/the-shortest-gm-game-ever
I am curious what it is!