It's customary to fill a glass and toast with your favorite champagne, but have you ever tried washing your hair with it? Cuvée founder Rachel Katzman toyed with the idea after being showered with 21 bottles of bubbly on her 21st birthday. Champagne was spilling everywhere (including in her hair). Katzman tells SELF that the boozy residue left her strands feeling soft and filled with texture. So, she decided to work with chemists to whip up a hair-care line with champagne as a key ingredient.