For three years, Madam Ng Wai Leng would wake up to find cigarette butts, cockroaches and even faeces thrown into her flat.
Traumatised by this, her family installed a closedcircuit television (CCTV) camera and caught the alleged culprit in action.
It was her neighbour.
And she believes it all started because of a pair of slippers.
She said: "I woke up one morning to find my slippers missing, so I asked my neighbour about it.
She must have been insulted that I would suspect it might be her."
Madam Ng said that when she moved into her five-room flat at Block 746, Jurong West Street 73, eight years ago, everything was peaceful until her neighbour, Madam Soh, moved in with her family three years ago.
Madam Soh would allegedly hurl vulgarities and verbally abuse Madam Ng's family when they walked past her flat.
Madam Ng, a 37-year-old sales coordinator, said her neighbour had hurled insults in Hokkien at her and her children, aged eight and 10, as she was taking them to school on at least five occasions.
"She cursed my husband to die in a car crash and scolded us for making a sound while walking outside their flat. How is it possible to not make a sound while coming out of the flat?" she said. "I'm worried for my children's safety. Thankfully, they don't understand the Hokkien vulgarities."