This one's from the nice folks at Cracked.com - they ran a lengthy article on loopholes. One of their six exemplars speaks to the Tea Party people, so I thought I'd seed it here. The relevant section speaketh as such:
In the late 1960s, Leonard Casley grew way too much wheat, which could only ever be a serious problem if you live in Australia. You see, Australia had wheat quotas at the time and Hutt River (the province where Casley and other families grew) had inadvertently surpassed it, meaning they weren't allowed to sell any of it. When they petitioned for the quota to be raised, the governor responded by saying, "No," and filing a law to take their land away. THAT'S how serious Australians are about wheat. Wheat and dingoes are two things they never take lightly.
In a desperate attempt to delay the legal process, the five families of Hutt River seceded from Australia under the Treason Act of 1495. This would have been as pointless as that time you were five and told your mom you were leaving home... if the government hadn't accidentally referred to Casley as "Administrator of Hutt River Province" in official correspondence, which actually gave him legal recognition as a ruler under Australian law. Yes, in Australia, calling someone something magically turns them into that. Taking full of advantage of the mistake, Casley declared himself His Majesty Prince Leonard I of Hutt, meaning it was now treason, under Australian law, to charge him with any crime or interfere with how he ran his new country.
Could Australia have stopped him? Sure. But by the time they got around to it, the statute of limitations had run out. So as of 1972, The Principality of Hutt River had officially seceded from Australia and stopped paying income taxes. As of (this) day, Hutt River is still separate, while Australia treats it as a private business that doesn't pay them taxes and just tries, really hard, to pretend it's not there.
And if you really want to visit, here is the Official Government Contact Page for the Principality of Hutt River. Enjoy!