Context

This line is spoken by Dobbs, played by Humphrey Bogart, in the film The Treasure of the Sierra Madre, directed by John Huston (1948).

In The Treasure of the Sierra Madre, Humphrey Bogart plays a prospector looking for gold in them thar hills. He's not the only one. When a band of banditos shows up pretending to be the police, Bogey demands ID. "Where are your badges?" he asks. And the alleged police respond, "Badges? We ain't got no badges. We don't need no badges. I don't have to show you any stinkin' badges!"

If you get that response, chances are they're not the police.

Where you've heard it

This is one of the most famous misquotes of all time, often combining a couple lines into "We don't need no stinkin' badges." You've heard it in everything from Mel Brooks movies to Portlandia. 

Pretentious Factor

If you were to drop this quote at a dinner party, would you get an in-unison "awww" or would everyone roll their eyes and never invite you back? Here it is, on a scale of 1-10.

Okay, it might not be pretentious, per se, but it's pretty much illegal to impersonate a police officer. Just say no, kids.