Comeback sauce (sometimes spelled kumback or cumback) is a distinctive dipping sauce and salad dressing often seen in the cuisine of central Mississippi. Similar to Louisiana remoulade, the base of the sauce consists of mayonnaise and chili sauce (or some approximation of that combination). The origin has been credited to The Rotisserie, a Greek restaurant that was located in Jackson, Mississippi.
Several Jackson, Mississippi restaurants serve their own variations of the sauce and many offer bottled comeback sauce.

When I first heard of this sauce last year, I wondered if it was just a glorified easy peasy fry sauce, and wasn't too keen on making it, but then I came across a few recipes for it and it definitely was not a simple fry sauce, I mean there was other stuff in there that I could tell would really give it a good flavor.
Go ahead and give it a try and let know what you think, oh and the longer it sits in the fridge, the better it tastes, I guess because the flavors really get a chance to come together.
Anyway, here is the recipe, I always have a jar and honestly it doesn't last very long because the kids eat it with fries, with chicken nuggets, with fish sticks, they even dip their pizza in it. It's really good, OH and it's great on salad too :)

Comeback Sauce
1 cup mayonnaise
1/4 cup chili sauce
1/4 cup ketchup
1 teaspoon mustard
Few dashes of hot sauce (depending on how hot you like it)
1/2 teaspoon onion powder
1/2 teaspoon garlic powder
1 tablespoon Worcestershire sauce
black pepper (I just eyeball it)
1/4 cup light olive oil
Juice of half a lemon
Mix all the ingredients in a blender until smooth. Pour into a mason jar, close the lid and keep in the refrigerator.

BTW, I've made it before without the chili sauce and it's still delicious....and there have been other occasions that I didn't have lemons on hand and left the juice out and it was still really good too :)