Favorite roles in movies?

Leonardo Dicaprio ad Billy Costigan and Matt Damon as Sergeant Sullivan in The Departed

Heath Ledger as the Joker. Yeah, I'm original.

Al Pacino in Scarface
Jake Gyllenhaal in Donnie Darko 
Edward Norton in American History X and Fightclub. 
Brad Pitt in Inglourious Basterds.  
 
To mention a few.

Peter Sellers as Dr. Strangelove in "Dr. Strangelove:  or How I Learned to Stop Worrying and Love the Bomb" 
 

Mike Myers as Austin Powers is probably the character and role i enjoy the most 
 
 

Brad Pitt in Fight Club.

So many, but here are a few favorites from the top of my head. 
 
Mr Pink in Reservoir Dogs: 
 
  

Robert Shaw in Jaws:

  Donald Pleasance in Halloween (1978): 
 
  

Anthony Hopkins as Hanibal Lecter in The Silence of the Lambs
 
Samuel L Jackson as Jules Winnfield in Pulp Fiction
 
I can think of lots more, but two is a nice number :)

Clint Eastwood as Dirty Harry.  He's so badass.

Everyone else has said pretty much all of mine but Sean William Scott as Stiffler in American Pie always makes me laugh.

Jude Law as Jerome Morrow in Gattaca and Hanna Schygulla as Susanne Staub in The Edge of Heaven.

Brad Pitt and Mickey O'Neil in Snatch.

Javier Bardem @ No Country For Old Men
 
Min-sik Choi @ Oldboy
 
Jean Reno @ Léon
 
Edward Norton @ American History X

Let me think...

Malcom Mcdowell as Alex DeLarge in A Clockwork Orange 
Timothy Dalton as James Bond in The Living Daylights/License to Kill 
Brad Pitt as Tyler Durden in Fight Club 
Antonio Banderas as Armand in Interview with the Vampire 
Ayako Fujitani as The Woman in Shiki-Jitsu 
Al Pacino as Frank Slade in Scent of a Woman 
Al Pacino as Sonny Wortzik in Dog Day Afternoon 
Robert Deniro as Jake LaMotta in Raging Bull

 
Mike Myers in Austin Powers
Robert DeNiro in Oceans 13

x L D en>en Google C

Mike Myers in Austin Powers R

"  
Mike Myers in Austin Powers
Robert DeNiro in Oceans 13

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Mike Myers in Austin Powers R

"

Tom Hanks in Cast Away

" @OutOfBounds9000 said:

"  
Mike Myers in Austin Powers
Robert DeNiro in Oceans 13
"

Psst...you probably mean Al Pacino in Oceans 13 :) "

 
Al Pacino-Scarface-Tony Montana
Ben Stiller-Tropic Thunder-Tugg Speedman
Jack Black-Pick Of Destiny-Jack Black
Jack Black-Be Kind Rewind-Jerry
Jack Black-Tropic Thunder-Jeff Portnoy

Mickey Rouke - The Wrestler
Al Pacino - Heat and Scarface
Charles Bronson - Man With a Harmonica from Once Upon a Time in the West
Forrest Whittaker - Idi Amin, from The Last King of Scotland

Daniel Day Lewis, who would win the Oscar for best male lead as Daniel Plainview in There Will Be Blood 
 

Tom Hanks in Cast Away.
Crispin Glover in Back To The Future.
Christopher Lloyd in the Back To The Future movies.
Tim Robbins in The Shawshank Redemption.

" Everyone else has said pretty much all of mine but Sean William Scott as Stiffler in American Pie always makes me laugh. "

Will Smith as Robert Neville in I am Legened

Robert Downey Jr. in Tropic Thunder

Tom Hanks in Forrest Gump 
Sacha Baron Cohen as Borat 
and Zach Galifinkis in the Hangover

 
@OutOfBounds9000 said:

" @SILIK said:

" @OutOfBounds9000 said:

"  
Mike Myers in Austin Powers
Robert DeNiro in Oceans 13
"

Psst...you probably mean Al Pacino in Oceans 13 :) "

Robert DeNiro was good too!!!! "

" @OutOfBounds9000: I'm not sure how to tell you this, but as far as I know, Robert De Niro wasn't in any of them :D "

The name's Plissken.