I thought about this choice long and hard and finally went with Die Hard. No surprise that the votes are almost dead even. While Back to the Future is a quintessential 80's flick die Hard is a quintessential one man against throngs of bad guys flick. If I was asked to pick a movie that defines both of these types of movies both would be in the top 5. Like them both equally but would forced myself to choose one. In the end, Yippi Kay Yah Mother Fla la la!