It's hard to find individual moments, but in general: Anton Chigurh is the scary foreign Terminator. Everything about him is unsettling. On top of that, there's the bleak, eerie film noirish atmosphere, even in the daytime. And then there's gunshots and blood everywhere, and special mention goes to Anton's captive bolt pistol.
The entire coin toss scene, but special note fits to an exchange earlier in the scene, when Chigurh asks the clerk what time the store closes. The clerk replies that it closes around dark. Chigurh then asks what time he goes to bed. The replies with 9:30. Chigurh responds: ‘I could come back then’.
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