[scruffyherder]

having been stopped by immigration people in several countries always have your papers on hand.

There is nothing less fun than being arrested, and going through processing (which takes FOREVER) to then talk to someone much later that'll take down details arrange cops to either pick it up for you (by ramsacking your room) or escort you there to pick it up (by ramsacking your room first).

If you are an immigrant in another country, also keep your papers on your person 24x7x365. All it takes is one jerk and bamm your how day or week just got ruined.