As near as i can tell, the gross mispronunciation of "Danke Schön" may come from Wayne Newton's song, "Danke Schoen" where he mispronounces it exactly as Accipiter described.

Another quick lesson in German - the 2 dots over certain vowels is called the umlaut. You can substitute an "e" after a vowel instead of putting an umlaut over it, which may not be possible in some fonts or on some terminals.