The only safe way would be for all 3 of you to drag out your cannons and bang away at the same instant like a firing squad.
5 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.
You can hear this line at 01:01:10.070 in the Blu-ray version of the movie.
Quote context
[...]
- Another guy may come along tomorrow, maybe a dozen other guys.
- You start bumping people off, just how far are you prepared to go with it? Ask yourselves that.
- We wouldn't stop at anything to protect our interests.
- I claim killing me isn't it.
- But of course, that's for you to decide.
- As for choice number 2, if you run me off, I might very well inform on you.
[...]