You have read this article fonts / graphic design / quizzes / time-wasters with the title Quiz: Which is the real logo?. You can bookmark this page URL http://jenkrebs.blogspot.com/2009/10/quiz-which-is-real-logo.html. Thanks!
Think you can tell Arial from Helvetica? Take this quiz, in which David Friedman found 20 logos originally designed with Helvetica and swapped it with Arial. Your job is to pick out the original. Have fun. (Via Swiss Miss.)