Dont go to office looking like this. Its not only discourteous but extremely offputting. If you are in no mood for small talk or any conversation,you can always go to your private corner and brood until you get over the depressive feeling. But avoid interacting with colleagues with this look- it is depressing to others and for many,it evokes feelings of wanting to take MC for the day!!Cheer up and have a great day. Vijay- The Midnight Owl
