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The copy reads "Only 2.9% alcohol." That way, you'll notice that the girl with the pretty face is actually a ZOMG FATTY, and the girl with the nice rack is actually ZOMG UGLY!!!
(I actually think that girl's cute as hell, side from the pathetically photoshopped breasts, but WTF do I know? Shaker Mendacious D, who gets the hat tip, suggests the second girl is maybe supposed to be "nerdy" rather than "ugly," per se—and I can definitely see the "eww, brainy girl" element there, too; guys don't make passes at girls who wear glasses, and all that.)
Basically, Coopers is selling itself as the beer so low in alcohol you won't get so drunk that you'll accidentally fuck a fat or ugly/nerdy chick. Nice.
What I find really curious about the first ad is that the "fat chick" is wearing what appears to be an engagement ring. Doesn't that suggest she'd say no anyway? Is the implication that some poor slob not only fucked her but got engaged to her because he drank beer with a high alcohol content? Ridic.
[Assvertising: Parts One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen, Twenty, Twenty-One, Twenty-Two, Twenty-Three, Twenty-Four, Twenty-Five, Twenty-Six, Twenty-Seven, Twenty-Eight.]