Favorite Classic Chracter Actor and why

[WS]

So who is your favorite character actor and why?  You know that person who usually isn't a star, but who shows up over and over in those unusual and interesting parts, like Jesse White the old Maytag repairman, or  Thelma Ritter, the wise-cracking insurance nurse in Rear Window (also the dresser in Al About Eve).

Here she is as a Mom looking for a toy in Miracle on 34th Street:

I love Thelma Ritter because she plays such smart-alecky, cynical, working class characters.

[Falcon]

Cool name for a kitty.