Why and whats the logic of many film tag lines?

Hi friends

I am confused about Tag lines. there are movies with more then one tag line. I want to know how these tag lines are used? i mean more then one tag lines... suppose if i have a movie....and i place a tag line will it not look funny to have 2 or 3 tag lines coming at the same time ?
so what the logic of making many tag lines? and how more then one tag lines can be used in the best possible way?

Regards
 
You may have seen multiple taglines listed because they changed the tagline, or you may have seen different taglines for different countries.
 
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