When she saw the ceiling buckle while watching a play in London's Apollo Theatre, she thought it was part of the performance.
Even when the actors on stage shouted "watch out!", Ms Sheryl Kang, a Singaporean whose sister was sitting some distance away, still assumed it was part of the show.
But to her horror, rubble then came crashing about four storeys down to those sitting in the stalls on the first level.
More than 80 people were injured, seven seriously, when the ceiling of the theatre collapsed on Dec 19.
The play The Curious Incident Of The Dog In The Night-Time, adapted from Mark Haddon's novel of the same name, was being performed at the time.
Though Ms Kang, a legal counsellor who turned 30 on Tuesday, was unhurt, the accident sparked a frantic search for her sister, Sheena, 22, in the ensuing chaos, as many of the 720 people rushed for the exits.
Recounting her experience to The New Paper on Monday, Ms Kang said she was visiting her sister, who is pursuing a master's degree at the School of Oriental and African Studies in the University of London.
They decided to catch the play at the Apollo on Dec 19.
Ms Kang, who got married early last year, said: "We managed to get last-minute tickets costing about £15 (S$30) to the play after we both read and loved the novel when we were young.