When you WWOOF, you don't get "paid" in the traditional sense, but what you are doing is working in exchange for room and board. And in some countries, you're not allowed to WWOOF unless you get a visa issued by that country. That needs to be done in advance. You can't just fly to the country where you plan to WWOOF and say, "I'd like a visa, please!"

Claire WWOOFed in Sweden and Spain for two months with no problems, but when she went to Ireland, she and her girlfriend were stopped in customs. Ireland, as it turns out, is one of a handful of countries that require a special visa just for WWOOFers and other work exchange programs, called a working holiday visa. Claire and her girlfriend were detained, their mugshots were taken, and they were kicked out of the country. Not ideal.

Other countries consider WWOOFers to be just like any other tourist, like in Europe where you can stay for just three months. Sam and Aubrey tested the limits of that rule when they WWOOFed. They stayed in Europe for ten months, moving from farm to farm. When they were heading back to the US, a customs official in Iceland called them out on it. After a tense moment, they were eventually allowed to return to the US but were told they wouldn't be allowed back to Europe for three months. Crisis averted, but the lesson here is one all travelers should heed: make sure your papers are in order before you leave the country.