Thunveni Yamaya (English: Third Part of the Night) is a 1983 black-and-white Sri Lankan drama film directed by Dharmasiri Bandaranayake.
Percy Peiris (Wasantha Kotuwella) and his new wife, Princy (Indira Jonklas), are on their honeymoon in the wet zone at an isolated guesthouse.
The violent emotional attacks escalate—Percy refuses to go to work, and when he finds that Princy has sent their servant, Michael, to watch over him, this sends him into a rage.
Soon after, Percy goes to the office and ends up setting papers on fire after his secretary makes some well-intentioned jokes about married life.
The conversation leads to wives and girlfriends, sparking the most violent act—Percy throws the hitchhiker to the backseat, and as the man escapes the car, Percy crashes, breaking his glasses and injuring his eye.
Princy visits him, and the doctor (Simon Navagattegama) tells her that Percy needs to undergo a psychological evaluation before he is released to explain how the accident happened.
It is revealed that as a child, Percy walked in on his parents having sex and his father (Gamini Haththotuwegama) beat him severely for it, scarring his psyche and ruining his ability to be intimate with his wife.