Catrin-Mai Huw, who played Stacey’s enemy, is now a secondary school teacher.
She appeared in just one scene of Gavin and Stacey, but Catrin-Mai Huw still gets recognized for her role in the show.
Huw played Stacey’s enemy Natalie Lewis, whose dad and brother – according to the script – once had a fight with Nessa.
Stacey and Natalie have a 32-second stare-off in a pharmacy, only interrupted when a customer asks Natalie: “Where to’s your fake tans?”
It’s one of many relatable moments that have caught the hearts of fans of the much-loved sitcom.
As Gavin, Stacey and their extended family prepare for one final Christmas episode, BBC News spoke to some of the smaller characters who have helped to bring their world to life.
Now a teacher, Catrin-Mai Huw says some people still quote the pharmacy scene when they see her – including her own pupils.
“I think a few years ago they’d done a meme out of that scene,” said Huw, 36.
“So I had several pupils saying ‘miss, can I show you something on my phone please?’”
Huw said the single scene, filmed in a day, was “really simple”.
“There’s hardly any dialogue but it’s fun,” she added.
“But because it’s literally one scene, it is funny how people still recognize me 15 years later!”
Father Chris – The sandwich vicar
When William Thomas was approached for a part in Gavin and Stacey he already had an impressive acting CV, with previous roles including Only Fools and Horses.