I'm the worst for this, but there's strong evidence to 'quit'.

Dining out for lunch everyday is a quick way to chew a hole in your wallet, especially if you work in an area where the cost of living is high. By brown-bagging lunch, you could save thousands over just a few years. Think I’m kidding? This lunch-savings calculator shows how swapping your $8 take-out for a $3 bagged lunch could save you $3,943 over three years. To make sure you actually save that extra $25 a week, boost the contribution level on your 401(k) so the money is automatically deposited into your savings.

[via WSJ and Terri Cullen]