Do you have a bank account? If you deposit or withdraw more than $10,000 in cash over multiple transactions, you could be imprisoned for up to five years. You could also lose every penny in the account, under the theory it "facilitated" your crime.

Do you have foreign investments? If you neglect to tell Uncle Sam about them, you could face draconian penalties. Forget to file just one form? You could face a $10,000 penalty per account per year.

There's no requirement that you know any of these crimes exist for you to be found guilty of violating them. After all, "Ignorance of the law is no excuse."

Given that fact, you might think that Uncle Sam would make it easy to understand exactly what's legal and what's not. Think again.

In 1790, the first set of federal criminal laws contained a grand total of 20 crimes. Since then, the number of federal crimes listed has grown like cancer.