"Five...five dollar foot longs." You've probably had Subway's catchy little ditty stuck in your head--ALL DAY--at least once by now.

Granted, it's not as nagging as Chili's "I want my baby back, baby back, back," but its pretty hard to shake, which might be a good thing.

Turns out, $5 is the latest win-win in fast food gimmicks. Subway raked in $3.8 billion with it, and now other restaurants are giving it a try too.

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