Don't buy on impulse, when you're buoyed by tropical cocktails and beautiful sunsets.

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"We're not seeing that impulse-control crime, " Mr. Parris says.

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Finally, it helps that books are quasi commodities -- there's no need to try them on before you buy -- and that they're small-ticket, impulse items that are easy to ship.

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Once you're done with the essay, avoid the impulse to have it edited by 10 people.

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And if the person doesn't resist that impulse, you have to have some form of legal authority to make sure that they're not infectious during their travel back to the United States.

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