the telephone box (la cabina) http://www.imdb.com/title/tt0065513/
a Spanish film about some bloke who can not get out of a telephone box.no subtitles as far as I remember but the fate of the man bothered me when I 1st saw this film when I was about 12.
edit.. its on you tube, only lasts 30 minutes but to me is a classic short film. http://www.youtube.com/watch?v=xX3nsrBFLUo