Semi-professional lunatic and occasional tech entrepreneur John McAfee, with some tips on getting by in the Third World:

The most powerful tool a traveler can possess is a Press card. It will allow you to completely bypass the “documentation” process if you have limited time or limited funds and don’t want to deal with it. I have dozens stashed in all my vehicles, in my wallet, in my pockets, in my boats. You might ask, since I claim to be an upstanding citizen, why I would need such deception. It is because I am one of the few white men who chose to live part time in the interior of the country. I was one of only three white guys living in the district of Orange Walk, for example. I have cars and enjoy driving and I travel frequently. Not a day went by without having go through a “checkpoint” of some kind.

I am paranoid about being caught without one when I need one. They have magical properties if the correct incantations are spoken while producing them. A sample incantation at a police checkpoint (this will work in any Central American country):

(Spoken before the officer has a chance to say anything) – “Hi, I’m really glad to see you.” (produce the press card at this point). I’m doing a story on Police corruption in (fill in country name) and I would love to get a statement from an honest police officer for the story. It’s for a newspaper in the U.S. Would you be willing to go on record for the piece?” You can add or subtract magic words according to the situation. Don’t worry about having to actually interview the officer. No sane police person would talk to a reporter about perceived corruption while at the task of being perceived to be corrupt. He will politely decline and quickly wave you through. If you do find the rare idiot officer who wants to talk, ask a few pointed questions about his superiors and it will quickly awaken his sensibilities. He will send you on your way.