In the musical Fiddler on the Roof, Reb Tevye laments in the opening line of "If I Were a Rich Man" that "It's no shame to be poor. But it's no great honor either!"

The image of the poor peasant is so powerful that when people come into even a small windfall, they start to think of Tevye, which is a pity because he's offering bad financial advice. In fact, the last thing that anyone should do if they come into extra money is to break out into song.

Of course, the odds of Tevye or anyone else striking it rich are tiny but many people do get windfalls from an inheritance that's neither as generous nor as wacky as those outlined in this story. More commonly, people get extra money from investments including stocks and real estate.

Though everyone's situation is different, there are a couple of principles that people with extra cash on their hands should consider.

Rule number one is not to act like you've won the lottery. You shouldn't act that way even if you hit the latest Power Ball jackpot. That saying about a fool and his money being soon parted is true. Remember spending yourself into huge amounts of debt is easy. Just ask Michael Jackson.

The best investment for most people is themselves. Pay off any high-interest credit card debt if you have it. Get additional training or education if you need it. If there's still money after those expenses, then consult with either a tax or financial planning professional about your situation. If possible, do this before you get the money so you can plan ahead.