You only get one chance to make a first impression.
We all meet people everyday and are consequently presented with the daily opportunities to make a good first impression. Could there by a more important or timely topic? The key is to recognize making a good first impression is always "on the table" so to speak.
Making a good first impression starts with having a good attitude. Jacqueline Kennedy once said "I want minimum information with maximum politeness." People don't always need to know exactly what is happening with you. Even if you are having a bad day its important to pull it together and have a positive attitude when you are making new acquaintances.
A good attitude is always the first step in making a good first impression.