Either way, we're hungry.

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We'll let the fact that one McDonald's has turquoise arches slide. But have you ever wondered why McDonald's signature logo is red-and-yellow?

Like almost everything in restaurant marketing, there's likely a very specific reason behind the move. According to Reader's Digest, it all comes down to psychology. "The color red is stimulating and is associated with being active. It also increases heart rate, which helps to jumpstart (sic) your appetite," writes Morgan Cutolo in the piece. "The color yellow is associated with happiness and is the most visible color in daylight, so that’s why a McDonald’s sign is so easy to spot on a crowded road."

WATCH: McDonald's Apple Pie Was Born in This Southern City

There's another theory about the McDonald's logo color combo that we'd be remiss to ignore — its likeness to ketchup and mustard. As brand expert Paul Findlay speculates in Mumbrella, an Australian marketing and media industry news site, "[The musatd-and-ketchup theory relates to] that gloriously nostalgic, yellow and red zig-zag sauce combination that proudly lives on burgers and hotdogs...This simple and very stealthful, sensory trigger lures even the best of us helplessly towards the prize like a pack of fast food zombies heading eagerly towards a McBrain Burger."

Now, if only someone could tell us why McDonald's Coke tastes better than all the others.

Oh wait, we did. Check it out above and consider yet another Fast Food Mystery slurped and solved.

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