If you have been asked to work on the weekend it is because there is a task that has just come up suddenly which needs to be done quickly and you are the only expert in your field capable of doing it. Work on the weekend is never work that could have been done any time in the past three months by any button pushing monkey if only the project you were working on was managed better and the company knew the first thing about what you actually do. Never that.
The normal office rules don’t apply to weekend work. This means that you can wear whatever you like, use as much internet as you like and adorn your cubicle with MORE than 4 personal items (although these must be removed before 7am Monday). You can also come in at whatever time you like, listen to music through your speakers and drink openly at your desk (rather than hiding a 4 pack of wine cooler in the climate controlled server room).
Working on the weekend does comes with responsibilities, though. Not only do you have to prove that you were in at all (see this previous tip for advice) but you owe it to your workmates to show how important you are. So in the following week constantly refer to the work you did on the weekend. Get included in the Monday morning sports wrap-up and say “yeah, I couldn’t catch the game, they needed me to come in on Saturday”. Your workmates will feel honoured to share a break room with you.
Most importantly, let your boss know you are always available as you had a fantastic time. This will guarantee you are never asked to work on the weekend again.