The Presidio, Sean Connery’s character, a Lieutenant Colonel, is having a drink in a bar with a SFPD detective (Mark Harmon) who he is working with. A drunkard begins to give the Lieutenant Colonel shit, talking smack about him and calling him “Major” repeatedly (context for those of you not famiiar with military officer insignia, both a Major and a Lieutenant Colonel wear a set of Oak Leaves for their rank insignia, the color of the insignia tells them apart)
Anyhow, attempts to talk the drunkard down fail, and finally Sean Connery stands up and informs the man that he is going to beat him senseless using only his right thumb… because his left thumb is far too powerful. Fight commences, and Sean Connery proceeds to beat the man senseless using (mostly) only his right thumb and various judo-type moves, using the drunkard’s considerable size against him and sending him careening into tables, the bar, and other patrons.
At one point, the drunkard’s buddies rush in to help him, and the detective draws his gun and waves it in the air, asking that they keep the fight fair, and the drunkards back off.
By the end of the fight, Sean Connery has the drunkard pinned up against a wall by pushing his thumb into a pressure point on the guy’s neck.
“See these oak leaves here? They’re silver. That means I am a Lieutenant Colonel. If they were gold, then I’d be a Major. Do you understand?”
“Yessir!”
“Now, the next time you see an officer of the United States Army, you’ll be able to recognize his rank, and you won’t piss him off and risk having him accidentally hurt you. Do you understand?”
“Yessir!”
Sean Connery jabs the guy in the throat with his left thumb and drops him on the floor
Just an utterly awesome badass scene.