200 Items Or Less: The Man They Could Not Hang (1939)
A few thoughts: Boris Karloff plays a scientist on the verge of a life-enhancing breakthrough when he is convicted of a murder he didn't really commit -- at least not in the traditional sense. To go much further in describing the plot would mean giving away a great deal of the bulk of the film, so I'll just leave it at that. This isn't exactly new territory for Karloff, as he played his fair share of crazed, genius scientists, but that doesn't make this any less entertaining to watch. Well-paced at under 70 minutes long, the plot moves along at a steady clip and never goes stale. I like how the story shifts focus and - to an extent - changes genres as it goes along, culminating in a very fun sequence wherein characters are creatively killed off one by one. As is often the case with his movies, the main highlight here is Karloff. Though he winds up becoming a fairly stereotypical maniac, he still goes through changes that - as crazy as they may be - are partially understandable. Not essential Karloff, but well worth the watch.
Who would I recommend it to? '30s horror aficionados and fans of Karloff.