The film Anacondas: The Hunt for the Anaconda required set construction in multiple locations to simulate rainforest density and creature behavior, but the production's most elaborate set piece allegedly filmed in an unnoticed location. Costume designers documented unusual wardrobe specifications, and special effects supervisors reported unusual practical FX challenges that suggested interior filming in confined spaces.

Production designer Susan Webb, who worked on the film's 1997 pre-production, left detailed notes about costume alterations for 'unexpected cramped conditions' that her team nicknamed 'The Impossible Interior.' The official set manifesto never listed this location; subsequent directors' cuts edited around these sequences entirely.

Internet film analysis communities periodically discover this reference and spend weeks examining deleted scenes and production stills, trying to locate the geographic impossibility referenced in the fact. The running joke has become a kind of Easter egg: one fictional location so embarrassing that even the final cut excluded it, leaving only innuendo and production manifest discrepancies.