Along with The Day The Earth Stood Still in 1950, and Spellbound from 1945, another movie to feature the sound of a Theremin is The Lost Weekend, also from 1945.
[flv:http://www.dograt.com/Video/SEP07/LostWeekend.flv 400 300]
I’m sure you recognize Frank Faylen, who played Ernie Bishop, the taxi cab driver in It’s a Wonderful Life. I inserted the transition after Faylen says “Goodnight” and I chopped out Ray Milland’s escape from the alcoholic ward.
Great stuff with the mouse and bat! I wonder if director Billy Wilder enlisted the services of the technicians at Universal, who did the bats for the Dracula movies?