This happened largely because of Food Wishes. I was watching one of their videos on the world's favourite video streaming and came upon one for making pickles. Somehow, the pickle sandwich just got stuck in my head, driving me to Google for it. Little did I expect that the top search results from 'pickle sandwich' actually leads to peanut butter and pickle sandwiches. One site led to another which eventually led to me making one just to see if it tasted like how I imagined it.
It's actually pretty good. I'm definitely making these again.