It depends on the country, as each one of them has its own particular quirks. In Italy, the biggest issues surrounded bureaucracy, driving habits and language (and I'm quite good in Italian). You have to learn how to set those issues aside, accept that you will never change their ways and enjoy your brief stay in their country/culture. If you let the annoyances get to you, you'll end up being bitter and wanting to go home early. The only loser in that deal is you.
