When it comes to underappreciated comedy films, there's really no shortage out there. Science fiction in general offers up a ton of different ways in which a film can be based. There's all kinds of crazy antics that can be entered into when it comes to something like time travel. Certainly Back to the Future is one fo those films that stands the test of time, but it also doesn't really count as something that's underappreciated as it's gone down in the annals of film as one of the best franchises ever.