Isn't that the point?
If you saw the movie, you'll know.
If you didn't, explaining the context still falls short.
Then I'm wanting to make a different point, too. I posted what I did so that those who don't recognize the great quotes from great movies will have an easier time searching out the great movie to see/hear it for themselves.
I'm also surprised no has posted what may be the most ripped off/imitated quote that there is. This is the way I remember the original, from Treasure of the Sierra Madre:
Bogart to Mexican claiming to be a Federale: "if you're a Federale, where are your badges?"
Reply from Mexican: "Badges? We ain't got no badges. We don't need no badges. I don't have to show you any stinking badges!"