In honor of Movember, people around the world will be growing and sporting some pretty attention-grabbing upper-lip fuzz this month (and yes, there will be some women walking around with fake mustaches, too!). Launched in 2004, the Movember Foundation aims to raise awareness of men’s health issues, such as prostate and testicular cancers, mental health, depression and physical inactivity, by urging individuals to sign up with a cleanly shaven face, grow a ’stache from November 1–30 and contribute! But before you get involved, get inspired—LivingHealthy has compiled photos of 15 of the most memorable celebrity mustaches (for better or for worse), from mustachioed icons like Tom Selleck to contemporaries Matthew McConaughey and Brad Pitt.