Popcorn is a Human snack food made from cooked corn kernels, usually served with butter, cheese and/or salt. Since the early 20th century, it has been associated with films, as it is a traditional snack served at movie theaters.
In 2377, when Tom Paris recreated the Palace Theater, he also replicated some popcorn for his date with B'Elanna Torres. Later, when the crew was invited to a showing of Attack of the Lobster People, Neelix would offer popcorn (buttered and unbuttered) as they entered. (VOY: "Repression") Paris later ate popcorn while watching cartoons in his quarters after recovering from being brainwashed by the Quarren. (VOY: "Workforce, Part II")