Who is your favorite character actor?

This could be a poll-worthy topic, but for one person to construct such a list would be beyond presumptuous. Thought it might be fun to hear some nominations. I'm not looking for actors whose names top the bill, just bit parts combined with Bill Simmons' famous 'that guy!' quality. My list:

Rip Torn
James Coburn
James Cromwell
Dub Taylor
Brian Cox
Harry Dean Stanton
Denholm Elliott
R Lee Ermey
Sam Elliott
Christopher Lloyd
Sir John Gielgud
JT Walsh
Mako
James Whitmore
Ray Walston
Richard Farnsworth
Lance Henrickson
Keith David
Abraham Benrubi
Missi Pyle
Dan Hedaya

There's a fuzzy line between character and star sometimes (Coburn, Cromwell, Cox, Lloyd and Gielgud made my list, Oliver Platt, as an example, did not). How should one define it?

Gary