Interrogation psychological thriller short film (Itali/Span/Portug?)

[chobster]

Hi - looking for the name of a short film made sometime between 1970-2000 (?). Think it was Italian, but could have been Spanish or Portuguese. Plot goes something like this...

Man sitting in chair tied up with bright lights on him - everything else in the background is  black shadow. Man in chair is initially cocky but interrogation intensifies with threats of violence, eventually masked man with gun appears in background. Slowly man with gun moves closer and closer. Man in chair starts getting very nervous, denying (I think) everything.  Threats escalate and interrogator  orders man with gun to shoot, while man in chair begs for life (warning...Spoiler alert ahead)

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Man with gun fidgets, clumsily. Voices yells at man with gun to shoot and eventually man with gun pulls the trigger, blowing the man in chair's brains out.  Lights in background then turn on revealing a large studio. Man with gun is manically hysterical  and led away by two orderlies in white.  Man in chair, casually wipes away fake blood and lights up a cigarette, and chats with voice noting how this particular test subject showed restraint in waiting for so long to shoot, or something to that effect...

[akiratubo]

Ooh!  I posted about this movie a long, long time ago.  No one ever figured it out and neither have I.  I hope you have better luck!

[chobster]

glad I'm not alone! I think I saw it late one night on PBS a few years ago

[Feast0]

This sounds like "El tren de la Bruja" a Spanish short film.
The screenwriter is Nacho Vigalondo (the guy behind Timecrimes)