guitars (and other twangable instruments) in classic films

Last week I started teaching myself the guitar (it's not going too badly, in case you were wondering ;D) and that gave me an idea for a post: Guitars (and similarly shaped and strung instruments :P) in classic films.

Hmm, let's see if I can make it easier...

From: The Sound of Music (1965)

Two drifters off to see the world

From: Breakfast at Tiffany's (1961)

Put the blame on Mame, boys

From: Gilda (1946)

Oh! I really think you're swell!

From: The Parent Trap (1960)

Now you sing, Schmidt! 

(Starts around 4:20)

From: Lilies of the Field (1963)

I don't care if it rains or freezes 'long as I got my Plastic Jesus

From: Cool Hand Luke (1967)

I spent ages trying to think of other instances of guitars (and banjitars ;D) in films, but whilst I could think of many other instruments, guitars just weren't there. If you can think of any more, PLEASE let me know because I know there must be so many obvious ones that I've left off.