With October drawing to a close, men across the world are encouraged to grow some upper lip hair for the sake of men's health.
That's because next month marks the start of Movember, an entire month in which men are encouraged to sport a moustache for charity.
Throughout November men (and women) are urged to grow a 'tache to raise funds and awareness for cancer and mental health.
What is Movember?
The Movember Foundation is tackling men's health on a global scale. Its aim is to reduce the number of men dying prematurely by 25 per cent by 2030.
To participate in Movember, men are encouraged to shave their existing beards or moustaches and grow a moustache for the month of November - all while raising funds for men's health research.
The Movember Foundation puts this money towards research into prostate cancer, testicular cancer and mental health and suicide prevention of men - something extremely important as men are three times more likely to commit suicide than women.
After starting off in 2003 with just 30 men taking part, Movember now has nearly 5 million participants annually.
While moustaches have become rather retro, Movember allows us to celebrate the great Mo, which is why we've put together an edit of the 26 most weird and wonderful ones for a little inspiration.
From Charlie Chapman, to Ghandi and Tom Selleck, check out some of history's greatest moustaches and fly that mouth brow flag.
