All of these movies are frozen in time. Some contain actors who are no longer with us (Alan Rickman in Die Hard). Some have spawned franchises, and seen storylines branch off from the original. Others are marred by our knowledge of misbehaviour of the team behind the scenes. And some, believe it or not, were critically panned when they came out. Grease, for example, remains a relevant movie despite being 30 years old — but it was called "utterly without style" when it came out.