As Mollick explained, visitors to a foreign country have "an irresistible urge" to say something in that language, and whatever they say (a cited example being along the lines of "Where is the bathroom?") usually marks them as tourists immediately. Saying "I can eat glass, it does not hurt me", however, ensures that the speaker "will be viewed as an insane native, and treated with dignity and respect".[9]

"Take a tour of the most incredible industrial city in Europe. Ugliest city in the world according to a recent Dutch poll, Charleroi offers a wide range of thrilling attractions."