Such a cool, cool idea:

Psychologists have long known that people tend to overestimate the odds of rare events. Applying that behavioral insight, finance professor Peter Tufano of Harvard Business School has devised a clever program called “Save to Win.” Launched earlier this year for members of eight credit unions in Michigan, it is a cross between a certificate of deposit and a raffle ticket. Members who put $25 or more into a Save to Win one-year CD are entered into a monthly “savings raffle” for prizes up to $400, plus one annual drawing for a $100,000 jackpot.