Cute response!

But actually, Peter is making "an owl face" -- and it has nothing to do with the movie, which I've seen many times.

Peter Lorre was fascinated by owls. To amuse his wife, Celia, he liked to make day and night owl faces. Here's an explanation from a website on Lorre:

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Lorre seemed to be fascinated with the owl. In the endpaper of Celia Lovsky's diary, he wrote, "Dear Untier, for 1936, the memorable year in which the fairylike rise of the owl begins" and signed it with a sketch of an owl. Peter also loved to amuse Celia with his owl faces. In fact, the most prominently displayed photo of him in her apartment pictured -- in several images, side by side -- making his famous day and night owl faces. In Crack-Up (1936), he even worked the "faces" into his portrayal of "Colonel Gimpy".
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www.peterlorrebook.com/plphotos2.html

This is the official website for "The Lost One: A Life of Peter Lorre" by Stephen D. Youngkin. Plenty of information here about the book and Peter himself, including a biographical sketch, reviews, interview with the author, sample Lorre credits (Stage, Film, Radio, and TV), and tons of photos.

Sammy