We have become obsessed with watching hair and makeup videos on YouTube. Why? Maybe because we like the seasick feeling we get while watching the amateur camera work (kidding, kidding). Or because we can't get over how many of them use the same eyelid primer. Weird, huh? This is the one they ALL use. Anyhoo, these are 10 videos we learned a beauty trick or two from. Prefer to watch more pro-looking how-to videos? Don't miss this one. Or this one.

• Hate watching videos online? Get beauty tips here instead.

• Can't get enough of them? Check out this video library.

• Get a free product sample here -- and learn how to use it later.