When I was a kid, I didn't really like jelly, so whenever I had a peanut butter and jelly sandwich I would refer to it as a "PBJ, hold the J". As my taste buds have gotten older, they have learned to enjoy the taste of jelly.
I still usually only put peanut butter on my peanut butter sandwiches though, because even though I like jelly now, it still doesn't taste as good as nostalgia.
