Psychonauts
Planescape Torment
Beyond Good and Evil
easily all 3 are in the top 20 games of all time but aren't as popular as they should be.
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http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ