I've started a "Detective Conan" reread and figured I ought-a check out some of Aoyama's influences, and people seem to like this movie based on an Edogawa Ranpo detective novel, so, you know, as good a place to start as any.
#225, or #875, 1968's "Black Lizard," (黒蜥蝪, "Kurotokage")
Proper back-to-basics Predator flick, without ever feeling like it's retreading anything -- and the stuff here I've seen before elsewhere it just does excellently.