Dreams. We all have them. Some can be simple, like aspiring for good health and a loving family. Others can be a bit more far-fetched, like one day seeing Leeds win the Premiership, or having Hugh Jackman return as Wolverine in the Marvel Cinematic Universe. Everybody has had a dream at some point in their lives, and while some people manage to live theirs, the sad truth of the matter is that a lot of us will not.
Movies are no different, and for every schlubby Seth Rogen character who somehow ends up with an insanely hot wife or girlfriend, there's a character who devotes themselves to realising the perfect, dream version of their life - or has a particular goal or desire in mind - only to fail spectacularly along the way.
Sometimes it's their own fault, with their ambition clouding their common sense, but factors outside the character's control can also be an issue. In either case, these movies carry important lessons for us, since they reveal how people react when they fail to realise their dreams, and show us the mistakes that lead them down that path.