Immigration Humor: Closing the Borders

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Saw this tweet today from Sheriff Jim Wilson - DEAR CONGRESS: When we asked you to close the borders we didn't mean the book store, we meant the area south of the US!!!!!

More... (http://blogs.ilw.com/gregsiskind/2011/07/immigration-humor-closing-the-borders.html)

[thankgod]

Its really funny

[ConEdison]

I can't figure it out totally....

[Sreeshankar]

I can't figure it out totally....

Dear friend,
The author has used a method or figure of speech,(malapropism or antiphrasis ( I am not sure), to some extent when he uses the word "borders" here. Apart from meaning Fence, Borders, is also the name of a big book store chain in US, which recently is closing all its outlets.
borders book store - Google Search (http://www.google.com/search?aq=f&sourceid=chrome&ie=UTF-8&q=borders+book+store)
Thanks