>>Most of them one just gets used to, but some never sit well in one's mind, even in their first language. For instance, one that never sits well with me is the "in the tree" or "in the Moon" in english. For me, it implies being inside, in a hollow trunk or dug deep below the lunar surface. On the other side, "on the plane", "on the bus" sound like you got the cheapest possible tickets and have to sit on the roof.
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>Reminds of something. I was born and raised in Ukraine when it was part of the CCCP. Back then you would always say "Go On Ukraine" (in russiain на Украину) and it was fine. Now that the Ukraine a country they consider the expression "Go On Ukraine" as an insult and you have to say "Go In Ukraine" (в Украину). The reasons: 1. when referring to all other former soviet countries they use "in" (в Россию, в Армению, etc.) 2. The On in Russian sounds like "пошел на ху... :) (I hope you can read the cyrillic). So when I was visiting the old country recently I had to watch my language <g>.

Все понял :).