[genwin]

Have you ever not paid sales tax to your state, on an item you purchased tax-free online? That's felony tax evasion when the amount is high enough; varies by state.

[aidenn0]

Slight nit-pick; you need to pay use tax, not sales tax. Sales tax would be an illegal state regulation of interstate commerce.

[mpyne]

Use tax, not sales tax. If you're going to list obscure laws you should list them correctly. ;)