Back in 2003, a group of men in Australia came up with a novel way to raise awareness about health issues including prostate cancer and depression among men.
The plan was to let their moustaches grow for the 30 days of November. Thus their faces would become walking billboards, allowing them to strike up conversations about those health issues.
They would also raise money for health charities along the way.
Thus Movember — or "moustache meets November" — was born.
Since then, the annual phenomenon has gone global, spawning a whole swathe of hirsute followers, or so-called Mo Bros, each November.
Spain is no different. Home to moustaches as iconic as those of Salvador Dali and Diego Velázquez, the country has taken to Movember in a big way in the last couple of years.
"Last year nearly 6,000 people in Spain took part and we raised €80,000," Movember spokesperson Charlotte told The Local.
This year, more than 5,000 people have signed up, and it's not too late to join in.
It's not just Mo Bros either. Mo Sistas can also help out by raising funds — without the discomfort of a scratchy face.
Now, to honour the efforts of all these people, The Local Spain has come up with a gallery of Spain's top moustaches.
From footballers to politicians to television presenters, some of these mos have to be seen to be believed.