A formulation primarily used to pitch a show or to quickly sum up the impression a show gives by expressing it as the sum of two separate, unrelated shows. The most famous variation is ""Die Hard" on an X", where X is a different location, means of mass transportation, or IN SPACE!, and so on. It's very common in music writing — both reviews and press releases usually describe an artist as "Artist X meets Artist Y". Similarly, a work of literature may be reviewed as being the fusion of the styles of two authors; a common variation is to say that a novel is "as if X had written Y". Should more works/characters be added into the mix (e.g. X + Y + Z...) and it starts specifically using mathematical symbols to define the work/character as parts of others, it becomes Troperithmetic. When this happens with multiple real-life stories, see Patched Together from the Headlines. This is the undoubted result of tropers' liking their Juxtaposition Gags.
