25. Ketchup
Although most ketchup bottles will instruct you to refrigerate after opening, ketchup generally has enough preservatives to keep it from spoiling without refrigeration. Many restaurants will keep ketchup bottles on the table for extended periods of time.
24. Olive Oil
Olive oil should be stored in a dark, cool area, and in a tightly sealed container. Colder temperatures will cause the olive oil to harden into a texture that is similar to butter. A study reported by the Journal of Food Science stated that olive oil may begin to lose its antioxidant benefits, however, if left sitting on a shelf for 6 months or longer.