In 'Spinal Tap' and Its Sequel, Rock Fact and Fiction Happily BlurInitially drawing from real life, the director Rob Reiner and his cast found that actual bands experienced moments from their work.
Source: In 'Spinal Tap' and Its Sequel, Rock Fact and Fiction Happily Blur (https://www.nytimes.com/2025/09/12/movies/spinal-tap-2-the-end-continues-movie-true-facts.html)