The one that came riding in back at the train stop laughing and scratching, saying how good it was to have something to do.
8 seconds sound clip from the The Train Robbers movie soundboard.
You can hear this line at 00:48:37 in the Blu-ray version of the movie.
Quote context
[...]
- I'll believe that when I see it.
- Wonder whatever happened to that old boy.
[...]