[about Curtin] Maybe I'd better leave him like he is. Ain't very likely anybody will find him. In a week's time, the buzzards and the ants will have done away with him anyway. [A tiger's cry startles him.] I don't know what's getting into me. Was that really a tiger? No. What if his eyes are open, looking at me? Best thing to do is to get to the railroad in a hurry. It's better not to have buried him. I did right, yeah! What I should have done, maybe, bury his clothes and leave him to the ants and the buzzards...Buzzards! If somebody saw them circling, they'd know something was dead. Buzzards ain't spotted him yet. Lucky for me. [He runs back, but cannot find Curtin's body.] Curtin! Curtin! Curtin! Where are you? Curtin! I gotta get ahold of myself! Mustn't lose my head. There's one thing certain, he ain't here. I got it. The tiger. Yeah, yeah that's it. The tiger must have dragged him off to his lair, that's what. Yeah, pretty soon, not even the bones will be left to tell the story. Done as if by order.
[about Curtin] Maybe I'd better leave him like he is. Ain't very likely anybody will find him. In a week's time, the buzzards and the ants will have done away with him anyway. [A tiger's cry startles him.] I don't know what's getting into me. Was that really a tiger? No. What if his eyes are open, looking at me? Best thing to do is to get to the railroad in a hurry. It's better not to have buried him. I did right, yeah! What I should have done, maybe, bury his clothes and leave him to the ants and the buzzards...Buzzards! If somebody saw them circling, they'd know something was dead. Buzzards ain't spotted him yet. Lucky for me. [He runs back, but cannot find Curtin's body.] Curtin! Curtin! Curtin! Where are you? Curtin! I gotta get ahold of myself! Mustn't lose my head. There's one thing certain, he ain't here. I got it. The tiger. Yeah, yeah that's it. The tiger must have dragged him off to his lair, that's what. Yeah, pretty soon, not even the bones will be left to tell the story. Done as if by order.
http://www.moviequotedb.com/movies/treasure-of-the-sierra-madre-the/quote_24482.html