"Now the first time you kill somebody, that's the hardest. I don't give a shit if you're ****in' Wyatt Earp or Jack the Ripper. Remember that guy in Texas? The guy up in that ****in' tower that killed all them people? I'll bet you green money that first little black dot he took a bead on, that was the bitch of the bunch. First one is tough, no ****in' foolin'. The second one... the second one ain't no ****in' Mardis Gras either, but it's better than the first one 'cause you still feel the same thing, y'know... except it's more diluted, y'know it's... it's better. I threw up on the first one, you believe that? Then the third one... the third one is easy, you level right off. It's no problem. Now... shit... now I do it just to watch their ****in' expression change."
That's a very underappreciated quote from an extremely quotable movie.