It gets interesting when we dwellers in Great Britain take the ferry to the Continent to cavort amongst the cheese-eating surrender monkeys and dope-smokin' dutchies.
Drive on the ferry on the left- couple hours later, and its off then, on the right.
After a week or two, you finally get to the point where you kind of get it right without constantly thinking about it (and without the wife/co-pilot nervously watching everything done, or not done....)
And then its back on the ferry on the right side, and a couple of hours later off again, but this time on the left....
and the whole process is repeated for the next week or so until you're sure you're home, driving where you're supposed to....