Short Films : cinematherapy


Im doing a class (3rd year psych nurse) on cinematherapy- every student must facilitate a group and I chose this. I was hoping for suggestions for a short film (10-15 mins) to illustrate my point (short films not used usually but its a short class).
It must be metaphorical: ie cinematherapy for an alcoholic wouldnt be a film about an alcoholic, but rather a vampire film perhaps where the vampire craves blood but can see the damage it could cause etc etc.
Any suggestions would be very welcome!