I normally wouldn't give five stars to a place where I found a hair in my food. But I admire how the waitress handled it. She was apologetic and had no hint of an attitude. She understood that it was gross and corrected it by giving me option to have another meal prepared or have the meal comped.
She handled a crappy situation gracefully, which unfortunately is hard to come by, and that's why a gross restaurant experience is getting 4 stars.