20 Things You Should Never, Ever Share

8. Makeup

Makeup like mascara and eyeliner is another thing we can’t go halfsies on. As dermatologist Dr. Laurie Polis told WebMD in 2010, “When it comes to bad makeup sharing habits, the eyes rank as the most dangerous. The most common viral infection of the eye is conjunctivitis, or pinkeye, which is extremely contagious.”