I know this leg means I won't last very long...
5 seconds sound clip from the The Good, the Bad and the Ugly (1966) movie soundboard.
You can hear this line at 01:36:44 in the Blu-ray version of the movie.
Quote context
[...]
- Sergeant, gangrene is eating my leg away, not my eyes.
- I know the prisoners here are being robbed systematically.
- But as long as I'm commandant, I won't permit any such trickery. Am I clear?
- Yes. Just as long as you're the commandant.
- I know this leg means I won't last very long...
- You and the others better lay low for a few days.
[...]