if I were trying to guess the top 20...
Brawl 2006
Other M 2009
Assassin's Creed 1 - I don't know which but I feel like something has to be here
Halo
MGS2 2000
MGS4 2006
Dead Island
Bioshock Infinite e3 2011
UC2 - opening
UC3 - Gamescom
Last Guardian
something Batman
something Half-Life
something FF13, or maybe Versus
something Blizzard for sure
Bioshock
Portal 2 reveal
I dunno
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xyzzy