Just don't follow this guy's example: A men stopped for donuts at a little bakery every day en route to work and became obese. So he went on a diet and stopped buying donuts, and after 3 months he'd shed a lot of weight and his coworkers were very impressed.

One day they were surprised to see him show up at work with a bag of donuts. "What happened?" they asked.

"Well," he replied, "my diet was going so successfully that I thought I deserved a little reward, so I decided it wouldn't hurt to get donuts this one time. But as I approached the bakery, I began to feel kind of ambivalent, so I said 'God, if it's okay with you that I have donuts today, let there be a parking spot right outside the bakery this morning'.

"And sure enough, on just the third loop around the block, there it was!"