Kopfrkingl himself, played by Rudolf Hrusinky, with the face of a gently demonic Charles Laughton and the manner of a malevolent Herbert Marshall, is a creation of considerable interest.

While it's a bit programmatic for my taste, this 1968 black comedy in black and white is undeniably creepy -- once director Juraj Herz enters the fractured mind of his protagonist, he refuses to budge.