How to be Smarter: Before giving someone a spare key, double-check that it is the right key for the right lock. One extra second to test that the key fits the lock can save a lot of headache later. How to be Prettier: Collarless blazers have the same shape and structure of an office-professional suit jacket, but the lack of a collar keeps the look relaxed and draws eyes upwards to your face.
How to be (less) Awkward: It's pretty rare that you say "hi" to someone and they don't echo a greeting back. If you want someone to acknowledge you, just greet them first and then you're (usually) guaranteed a hello right back.