20,000 South Koreans got their hands on a Sony PSP in a pre-order promotion. Apparently over 4,200 Sony PSP customers posted complains on this site demanding replacement PSPs because of dead pixel issues.

The Sony PSP is more expensive ($328) in Korea than in the US. A Korean Sony Representative is quoted on Asia Times saying:
"South Korean customers were too sensitive to dead pixels and their counterparts abroad had not made it a high-profile issue. The dead pixels (on the PSP screen) did not matter significantly in the United States and Japan".
Well it did matter quite a bit I would say, see this story.
More details on Asia Times.