The US cover of Freakonomics is a play on the old “comparing apples to oranges” phrase:

freakonomics cover

Well, it looks like comparing apples and oranges is a strange concept in many places. Check out the different analogies used on the cover (green egg yolks, banana corn, three headed scissors, etc.) from editions in foreign countries:

foreign cover foreign cover foreign cover
(L to R: Chinese, Denmark, Estonia)

foreign cover foreign cover foreign cover
(L to R: Indonesia, Norway, Hungary)