Look busy
I was on ESPN.com the other day "watching" my Cubbies (they won, by the way =D). I noticed an interesting ad at the top of the screen: "From where your boss sits, spread sheets and box scores look identical." It is an ad for Coca-Cola zero and it does more that don a cute saying. It will provide the sports fan at work with a spreadsheet to open in one click, just in case your boss glances over. All you have to do it "click here" as it says and up pops the spreadsheet.
Now isn't that nice of ESPN?