Don’t ever enter a meeting, even an informal drop by from your manager, without a notebook and pen.
Don’t be afraid to tell your manager you’d like to be busy—ask for more work.
Don’t be a social media or text addict, checking your status and phone can wait.
Don’t leave for lunch or at the end of the day without checking with your boss or peers to see if they need help with anything before you go.
Don’t decorate your cube with college party pictures; you are a working adult now.
Don’t party. You may be at a fun work function or event, but you are working (regardless of how much fun your bosses may seem to be having).