It's Sunday, so let's step back and see the bigger picture. This guy is Randy Pausch, a 47 year old professor of computer science at Carnegie Mellon University. He was diagnosed in August 2007 with incurable pancreatic cancer and given 6-7 months to live.
So he decided to give The Last Lecture on his childhood dreams and how many have come true. In other words, an exercise in gratitude despite the 'death sentence' he now faces. The lecture has become something of an internet phenomenon, simply because of the way in which it celebrates a life well lived - something all of us only get one shot at.
Randy personifies something psychologists and economists understand more abstractly: gratitude is good for you. In fact, simply sitting down once a week to write about five things we are grateful for can boost our happiness by 25%. So there you have it: just watch Randy's lecture and you won't have any trouble coming up with five reasons to be grateful.