Only in Japan: The Burger King Windows 7 Whopper

America may be the home of the corporate tie-in and super-sized fast food. But Japan may have just outdone the US in both fields.

In honor of Microsoft's new Windows 7 operating system, Burger King has served up a seven-patty burger. This mighty monolith of meat, more than five inches tall, will only be available for seven days – and only in Japan.

The Windows 7 burger favors the early birds. Each day, the first 30 customers get the Whopper for 777 Yen (about $8.50). Stragglers must pay closer to $17. But if you feast upon one for breakfast, you'd best avoid food for the rest of the day. The Whopper packs in about 2,100 calories – more than you should eat in an entire day, according to the FDA.

Burger King and Microsoft have had cross-promotions in the past. In 2006, Burger King offered $4 Xbox 360 games featuring the restaurant chain's King mascot.

Both campaigns are fun, yet not quite as clever as Apple's attacks against Windows 7.

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