 I've always put ketchup in the refrigerator after I opened it because I always thought that it would go bad. I keep all condiments in the refrigerator once they're open. So if my bottle of ketchup is open, I put it in the refrigerator. Bottom line, yeah, that's my whole life. So it's like it's not nothing that I came up with. That's just my family always did it. I always did it. Mustard, ketchup, soy sauce, barbecue sauce. Once the bottle is open, I put it in the refrigerator.