Grosse Pointe Blank
I used to obsess over this film when I was 15/16. I just though that John Cusack/Martin Blank was the coolest motherfucker ever. Anyway, still a great comedy (great one liners, one of the best fight scenes before The Hunted and Bourne trilogy, and a genuinely touching love story) and a killer soundtrack that adds something to the film (only just noticed the Pixies Monkey Gone To Heaven being played in one scene). The soundtrack also sparked my life long obsession to play Blister In The Sun perfectly.
And on a related note, Grosse Pointe Blank in lego:
I'm sure most if not all of you have seen it but if you haven't make the effort to do so.
I forgot how much I loved this exchange between Cusack and Akroyd: