Name That Trauma:: Reader Armando P. on Junk Yard Killer Robots & an Infected Thumb

I recently heard about your site through one of Geeknation's podcasts and was hoping to submit, for your approval, a "Name That Trauma."

The trauma– that I can't get out of my head after 20 something years– is a film where a group of people are held up in a junkyard (?), where the survivors are trying to figure out who is human and who is a killer robot, I think. Anyway, my trauma is a scene in the film where each survivor cuts their finger to prove their humanity. One of the survivors cuts his thumb too deep and it gets infected. That scene traumatized me just because the dirty and sweaty feel of it all. If you can help me find out the name of the film I will be eternally grateful. Kindertrauma, you're my only hope.

UNK SEZ: I sadly do NOT know the correct answer for this one! I was hoping it might be MUTANT HUNT (1987) if only to justify my posting a video from MUTANT HUNT. Oh well, we can still watch a scene from MUTANT HUNT as we try to identify the correct answer can't we? Yes, we can! MUTANT HUNT used to be on Netflix Streaming but then it ran away! Come back, little Sheba!