Hands down:

Great film, awesome actors, iconic scenes.

Neil McCauley: Don't let yourself get attached to anything you are not willing to walk out on in 30 seconds flat if you feel the heat around the corner.

Classical 90's crime movie in a suspense style, every frame a perfect painting, solid action. Inspired a lot of other movies and games.

Most Important: PayDay and PayDay 2.

Dumped over 1000h in that game, all thanks to Heat. 😎