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I believe so, it's a tradition for the whole USA? I ask because I wonder why I haven't seen it in any movie, since we watch a lot of American movies in Belgium (where I come from) !CTP

It's a tradition in the Midwest. But it's not really in any traditonal movies.

USA is big, of course... It's like saying "it's atradition in Europe" when it's only in a certain country in Europe....