For decades, hamburger chain Wendy's has been a staple of the fast-food world. (You'll notice we said "hamburger" and not just "burger." Wendy's founder Dave Thomas apparently took that very seriously.) But what exactly is the source of the restaurant's longevity? Could it be the food itself (notwithstanding the baked potato you should probably avoid )? Maybe it comes down to effective marketing, which has included commercials starring Reggie Bush and $5 Biggie Bag ads with recognizable music , not to mention a delightfully unhinged social media presence.

However, any businessperson will tell you that the key to success is effective branding, and few fast food logos are more iconic than the Wendy's girl. (Okay, the McDonald's golden arches definitely has her beat, but don't tell

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