Above: Getty Images result for "knife head"
Longtime readers know the Headstabbers literary/cinematic franchise is extremely popular (and prolific) in whatever time and place Wondermark occurs.
But a reader wrote in to let me know that it may actually be a remake! There is a 1978 German film called Messer im Kopf – in English, Knife in the Head.
As this review raves, the film contains, at least for the time:
“…arguably the most realistic enactment of a brain injury ever depicted in the cinema.”
A more succinct summary of Headstabbers you would be hard-pressed to find.