Sin City shows how the threat of the razor is entwined with closeness. When Jackie Boy goes to the bathroom, Dwight startles him by shoving a straight razor into his face:
Would this scene have had the same impact if Dwight was pointing it at him from across the room? I don’t think so. The straight razor is personal. To use it, you have to invade another person’s space.
If I wasn't already married...*sighs and fans self*