This article from Gizmodo serves to simultaneously illustrate the hazards of bad spelling and also contains some mistakes itself.

First the warning:
I do love the Swedes. Most of them. Maybe not the couple who drove 400 miles away from their destination because they misspelt its name—typing the industrial city of Carpi instead of the island of Capri—into their GPS. (emphasis mine)

Then the error:
Remember, swedes and everyone else: Do not follow technology blindingly, especially when technology could always fail because of our own human failures.

In English, unlike some other languages, nationalities are proper nouns and should always be capitalized. Writer Jesus Diaz already illustrated his knowledge of this in the first excerpt, but did not follow through here on the second.

Source: http://gizmodo.com/5326310/swedes-drive-400-miles-in-the-opposite-direction-thanks-to-gps-mistake