Office tip of the day: Get one of those inflatable wavy-arm air-blowing things you see advertising stuff in a life sized version of you. Then fire it up at the office to give the illusion of furious activity. This idea supersedes the kinko's printed lifesized cardboard cutout that rests with hands on keyboard.
That is all. Go back to what you were doing.
Or you can invert the process and draw attention to youself in the manner shown in the photograph below:
Now available on ebay: Mr Wavy Arm Guy kits! For women: Mrs Flaily Arms.