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I don't know if Direct X 9 shaders could do this but I thought something that would be kinda funny/cool for HL2 is a player idle animation where you see Gordon's hands come up to his face and momentarily remove his glasses to wipe them clean, leaving a blurry unfocused POV of the game world until the glasses are replaced. :rolling:
Just thought it would be a nice touch, and wanted to share.