This is a perfect office party game, because it combines a standard office activity with drinking yourself silly:)
You'll need some preparation before the party... but very little. All you have to do is put together a text that would take about 1-2 minutes to re-type.
Also get a few shots ready(use a cocktail mix, or some hard liquor, if you want people to get really wasted). Put the shots in hands reach of the person behind the computer.
Now dictate the text to that person. He has to write it down exactly as it is dictated. Whenever he makes a mistake, he has to take a shot(the rest watch, cheer and spot mistakes).