Don't Tell on Us: These are the Beauty Products We Stole From Our Siblings Growing Up

"My sister always had the best eyeliners, and I would, without fail, manage to sneak them into my high school makeup bag over time. The best was always the blackest black Rimmel liner ($4), which would smudge perfectly. In retrospect it probably wasn't wise to be sharing eyeliner in the era of the Laguna Beach-inspired raccoon eye, but I went for it and have many, many cringe-worthy pics to commemorate my theft!" — Casey McCormick, senior creative strategist