I never thought bananas with cheddar cheese was such an odd combination, but my roommates my freshman year in college set me straight on that when they saw me eating it. And, truthfully, even though it's a delicious combination, I don't know of other people who eat it.
Peanut butter with dill pickles is a slightly different matter, since I know I am not alone in eating it. My dad eats peanut butter with dill pickles. I think I had some commentary about that when I was a kid, but it eventually occurred to me that maybe he was eating peanut butter and dill pickle sandwiches because they tasted good. I was convinced when I first tried a bite. I also saw an article about peanut butter and pickle sandwiches a few years ago, so I know there are people outside my family who eat them, too!
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