The people around her at the basement of FairPrice supermarket at Toa Payoh HDB Hub pinched their noses and winced at the stench permeating the air-conditioned atmosphere.
Curious, bedsheet promoter Noriza A. Mansor, 49, went looking for the source of the smell.
At a cashier's counter, she saw a man in his 70s with dried faeces smeared all over his bermuda shorts, shins and shoes.
Unlike others who chose to ignore or avoid him, she did the remarkable: She bought him a new pair of shorts, grabbed a box of tissue paper and cleaned him up with a pail of water before sending him and his wife home in a taxi.
This amazing act of kindness happened on Tuesday at around 5.45pm.
Mr Tan Soy Yong, 76, had soiled his pants while grocery shopping with his wife, Madam Lee Bee Yian, also 76, who was wheelchair-bound. There was also a clump of faeces about the size of a 50-cent coin on Mr Tan's sandals.
Ms Noriza, a divorcee who has three sons and two daughters aged from 10 to 25, was alarmed.
"No one was helping him even though he looked so pitiful," she said.
She immediately approached the couple and offered to help them carry their two bags of groceries. Then it occurred to her that it must be uncomfortable for Mr Tan to walk in his soiled pants.
She hurried into ValuDollar, which was opposite FairPrice, to buy a pair of shorts for him.
But when she emerged from the shop, she realised that the couple had left the cashier counter.
She caught up with them a few metres away and insisted on helping Mr Tan push Madam Lee.
Meanwhile, currency trader Goh Rong Ren, 32, was rushing off for a dinner appointment with his friends when a passer-by tapped his shoulder and asked him to help the elderly couple.
He said: "I saw a Malay woman pushing an old woman on a wheelchair and she told me to wait for the uncle behind.
"When I turned around and saw him covered in faeces, the stench just hit me."
Mr Goh helped them to carry a bag of groceries, while the other bag was left on Madam Lee's lap.
Mr Tan insisted on taking the bus to his home at Potong Pasir as he could not afford a cab.
At this point, Madam Lee was a bit disgruntled, complaining about the hassle that her husband had created.
Mr Goh offered to pay for their cab fare and told them not to worry.
Though he thought of helping Mr Tan clean up, he said: "I wasn't willing to do it as I am particular about cleanliness."
When the four took the lift up to the main road, Mr Goh pushed Madam Tan to the kerb to flag a cab while Ms Noriza was at the back supporting Mr Tan.
When Madam Lee asked about her husband, Mr Goh turned and realised that Ms Noriza and Mr Tan were not behind them any more.