When you think of fast-food logos, you may not realize they have quite a few things in common. For example, they often have a smiling (if not kinda creepy!) mascot, letters in a bold font, and feature a similar color: red. But have you ever wondered why red? The Daily Meal recently reported on this, and cited a report from the University Of New Hampshire, that said red tends to trigger "stimulation, appetite, hunger, and attracts attention.