Nothing is as bad as regret. Knowing you could, and should have taken a risk, and yet you didn't, till it's too late. That regret pains many, many people. Therefore, live today. Do something you always wanted to do, even a small, obscure, unique, unusual task. Let me give you one silly example. Pluck a flower, rob it of its life (I did say it's a silly example?), approach a stranger on the street, and give the flower to him or her. I bet 99 out of a 100 people reading this suggestion, won't have the guts to do it… But if you're that 1%, you'll be amazed by the results. Both for you, and the recipient.