Monday is not the day to walk into the office dressed as a pirate (you should avoid all whimsy, actually). As happy as you might be, success in the office right now demands conservatism. This holds true on tuesday as well. Instead of being in-your-face, be in your office with your head down. Wednesday and thursday are better days, and more fun, but still, everything happens in a minor key. This atmosphere affects you, and by friday you're feeling a touch withdrawn. You go in to do your job, you go home. The upshot is that your weekend is graceful.