Dexter is in his comfort zone in this photo. Too bad for the dude about to die.
Added:

Dexter Season 3 Episode 10 Quotes

Dexter: Wow, I didn't get it before, Miguel, but you can't be reasoned with, guilted, controlled. This whole back and forth game for leverage is pointless.
Miguel: That's right. I'll do what I want, when I want, to whomever I want. Count on it!
Dexter: I will.

Miguel: You think this is funny?
Dexter: Not at all. They said that stain would come out.