Whilst being somewhat similar to a rather neglected thread in action (greatest action sequences) I think this earns its own place:

1. Three way showdown in l buono, il brutto e il cattivo extra points for being snobbish with the title of this classic?
2. Ripply and Queen Alien in Aliens
3. Deniro and Pacino in teh coffee shop in Heat
4. Brando and the Waterfront boss in On The Waterfront
5. Luke and Vader in The Empire Strikes Back

Luke and Vader in RoTJ
Predator/arnie in Predator
Neo/Smith in the Matrix/Reoloaded/Revolutions

yup, matrix revolutions was class! kickass showdown. crouchin tiger had a cool showdown between the two chicks but i wish the master guy got a cool end fight.

I'll probably add some more later, but one that came to me right away for some reason is Riggs Vs. Mr. Joshua in Lethal Weapon.

Fast Eddie (Paul Newman) vs. Minnesota Fats (Jackie Gleason) in The Hustler
Zorro (Tyrone Power) vs. Captain Pasquale (Basil Rathbone) in The Mark of Zorro
Rob Roy (Liam Neeson) vs. Cunningham (Tim Roth) in Rob Roy
The Kid (Steve McQueen) vs. The Man Himself (Edward G. Robinson) in The Cincinnati Kid

This message has been edited. Last edited by: mark f,

Within the genre of the good ol western gunfight I thought the showdown in "Open Range" was good because of its realism.
Who couldn't like the showdown in the first Rocky movie?
I thought the showdown between the greasers and soci(s) in "The Outsiders" was especially relevant to the message of the film.
I loved the courtroom showdown in Paul Newman's "The Verdict."
Finally, the showdown in "High Plains Drifter" was so unrealistic it was fantastic!

I'm sorry I have to include this, but I just watched it over the weekend and it played very heavily in my childhood: Daniel LaRusso Vs. Johnny Lawrence at the All Valley tournament.

Two Words: Crane Technique.

"The Wild Bunch"

The "Mexican stand-off" at the end of "Reservoir Dogs".
"If you kill that man, you die next. I repeat: if you kill that man, you die next." - Mr. White.

Rob Roy was a great movie. The duel at the end between Robert Roy MacGregor and Archibald Cunningham was one of the best ever filmed.

[quote]yup, matrix revolutions was class! kickass showdown. crouchin tiger had a cool showdown between the two chicks but i wish the master guy
yeh thats freat

Seriously Matrix Revolutions... When all of the Smiths wait off to the side... I would like to cleverly interject http://www.howitshouldhaveended.com/Divx%20links/The_Matrix.html .

Dumbledore vs. Voldemort - The Order of the Phoenix