A comedy whose premise revolves around a science-fiction-related concept such as: brain-switching (Vice Versa, Big, and Freaky Friday); transformations of size (The Incredible Shrinking Woman, Honey, I Shrunk The Kids et.al.) and species (The Shaggy Dog); time travel (Bill And Ted's Excellent Adventure, Back To The Future); scientific experimentation (Innerspace, The Absent-Minded Professor); and alien contact (The Cat From Outer Space, Earth Girls Are Easy). These comedies play the science fiction standards for laughs, often making the "mad scientist" either charmingly absent-minded or inept, and the classic science-vs.-nature predicament into fodder for wacky situations and shenanigans. They have always been popular with audiences, blending visual fantasticness with crowd-pleasing laughs.