I love the first comment - and it fits well into this manliest discussion:
Call me “Snake”.
Josey Wales: “Dyin’ ain’t much of a livin’, boy.”
Jack Wilson vs. Shane: I heard you’re a lowdown Yankee liar.
Maybe not the manliest bit ever, but it certainly illustrates the male mind - or at least the teenage mail mind. From Zits (the comic strip):
Jeremy: “Hector hit me in the head with a rock!”
Jeremy’s Mom: “Goodness! What were you doing?”
Jeremy: “Throwing rocks at each other.”
Would you believe I’ve been working on a list something like this, already?
I’ll have to go over my notes for the whole thing, but to start off…
speaking of Shane, the scene where Shane and the farmer work on getting the big stump out of the ground seemed to an exhibition of manliness. I think it made the farmer’s wife horny.
That’s one of the few movies I like to watch over and over. And every time I watch it, I wonder what would have happened if that guy in the ticket station, before anybody boarded the stagecoach, hadn’t told Grimes to leave Russell alone.
Clark Gable as Rhett Butler sweeping Scarlett O’Hara in his arms and climbing the stairs.
Although, upon reflection, would that e a crime today? Wasn’t she protesting all the way up?
Oh, dear.
Predator had several. The one I thought of was when Ahnuld’s character, having prepared himself for the final battle, lights a beacon fire and roars his challenge into the night.
Speaking of that: - Captain Ericson of HMS Compass Rose has a difficult decision to make and suffers for it afterward.
It’s perfectly clear at the start of the movie that is what is going on. Spade dumps the new widow right away because it will make them look guilty, but it was just a fling with him anyway.
They can’t take another attack, so they SING!
There will always be a Wales.
The Wild Bunch: “Let’s do it.”
Which is the same scene I linked to back in Post #7. 
I would like one of those Martini Henrys for my collection.
Wow, never saw that movie before. Thanks.
Okay, it was:
PIKE: Let’s go.
L. GORCH: Why not?
Then came ten kinds of manliness: http://www.youtube.com/watch?feature=endscreen&NR=1&v=3TLEcgNxqDw
You don’t leave Angel behind.
Yet another scene from Shane: When he tells the little boy (who admires Shane so much) to grow up like his father.
And in The Return of the King, when Sam goes after Shelob and when he carries Frodo up the mountain.
Excuse me while I wipe away this tear.
That is, indeed, a very manly moment. I’m a teacher and I am definitely finding a way to use that clip in class in the future. Thank you for that.
This thread is proving to be pretty in depth at this point. Color me impressed.
“My name is Maximus Decimus Meridius, commander of the Armies of the North, General of the Felix Legions, loyal servant to the true emperor, Marcus Aurelius. Father to a murdered son, husband to a murdered wife. And I will have my vengeance, in this life or the next.”
IIRC, Ebert’s review of the movie opined that if our hero had then gone for the jugular with that palmed arrowhead – and, okay, gotten sliced to ribbons a moment after getting the kill, but you can’t have everything – the film would’ve been twice as good.