How about just weird condiment "pickiness" ? I use a different condiment for fries from different places, and I can't imagine mixing them up. That would be just weird....
Wendy's fries: -------> Mayonnaise
McD's fries: ---------> Au Naturel
A&W fries: ----------> Ketchup
Peters' fries: --------> Vinegar
McCain fries: --------> Seasoning salt
KFC fries: -----------> Gravy
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