Sharing is not just a lesson they teach you in kindergarten -- it's an important part of being a compassionate, good person. So today if someone needs something you have, share it. Have a friend who's hungry? Give them half your sandwich. Meet someone who doesn't have quarters for parking? Pay for a half hour. These little gestures mean so little to you -- but so much to someone else. Being possessive of what you have is not going to do anything but alienate others and make you feel guilty.