Tab Clear and kamikaze marketing

gboudx said

Marty: Uh, yeah. Give me a, give me a Tab.
Coffee bar manager (Lou Carruthers): "Tab"? I can't give you a tab unless you order something!

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Marty: All right, just give me a Pepsi 'Free'.
Coffee bar manager (Lou Carruthers): If you want a Pepsi, pal, you've gonna to pay for it!