Got an exam coming up? Study, prepare, do your best and let it fly. I know, I know. Doing "your best" is a loser's mentality. Losers do their best and winners bring home the bacon. But in the end who cares if we win or lose? We're all going to end up 10 feet under either way! The more I think about it, the more I'd rather be stress-free than successful but constantly worrying about my responsibilities. I'm not saying we should completely shirk our responsibilities, but I won't let them dominate my life and cause stress! I think what I'm saying is success accompanied with stress is not worth it for me.
If I'm running late for work, I call my boss and let them know. I don't worry about getting fired. I don't rush. I might speed, but only because I enjoy speeding: not because I feel pressured to get to work quickly. Why worry? Yes, it would suck to get fired, but I refuse to stress over the possibility!
Don't stress, be happy, and savor every moment.