Ever get hassle with customs? Denied. Detained. Deported.
trickaduu.com
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I once spent about three hours arguing with immigration officials in "the back room" after a friend decided that "tourist" was a better answer than the real reason (going to a wedding, staying with my family)—but that didn't quite match up with other details ("where are you staying?" "how long are you here?" ...). [Note this was also prior to 9/11, and they probably err on the side of "grill" more often these days.]
The guy that did most of the grilling in that case (and who seemed pretty sharp) ended with this advice: "next time just tell the truth... it's a lot easier for everybody."
I think that's pretty much true.
Explaining a non-lie can be annoying as well, but not having lied is a much better position to start from.
On several occasions, I've seen customs and immigration officials behave aggressively, usually fidgeting with night-sticks (truncheons) in a way that suggests that they are itching to beat someone.
There are two kinds of people in the world: people who crave power, and people who don't. The people who don't aren't the problem.
There are two kinds of power-craving people in the world: people who act on their craving, and people who don't. The people who don't aren't the problem.
There are two kinds of people acting on their power craving in the world: people who try to join the military or the police, and people who don't. The people who don't aren't the problem.
There are two types of power-craving military or police cadets in the world: the ones who stay there, and the ones who don't. The ones who stay there quickly get their antisocial tendencies beaten out of them by their instructors, in the vast majority of cases, so they're not the problem.
There are two kinds of power-craving academy dropouts in the world: the ones who realise that power trips aren't for them, and the ones who don't. The ones who realise aren't the problem.
The rest become airport security guards. THEY are the problem.
For some reason the US immigration officier in Puerto Rico had forgotten to add a date to my entry stamp. I was stopped for this technicality, and while getting some paperwork for me in my car the custom officers found I had prescription drugs.
I was worried, but for no reason at all - they figured out the mistake that happened in PR, and checked the drugs official prescriptions matched (antibiotics and some pretty stong painkillers), and then I was cleared to go with a smile.
TL;DR : the US custom officer were friendly and efficient, and fixed a mistake.
I wouldn't dream of that happening in Europe, or (god help me) the UK.
But I can assure you that this story happens with US customs as well - if they think you are there to work in the country without a work VISA, you will get detained and it is not pleasant.
Customs officials are given a wide amount of powers, and little to no oversight. At this point, I feel like a US customs official could rape an entire squad of 13 year old cheerleaders live on air over the public airwaves and receive a tax break for the trouble. </bitter>
After ten hours of sitting in a room he was turned back, and we had to fly someone else down to teach the course. Moral: when you're asked why you're visiting a country, do NOT reply with anything that could be (intentionally) misinterpreted as "to find work."