How to get curls without heat, rollers or a whole lot of effort

This girl is a genius. Tutorials rarely ever work for my hair because it's awfully frizzy and wavy and never wants to cooperate with me. But I've done tried this method twice, both times with pretty good results.

Tip: It really does work better on dry hair; the second time I tried it, I thought I could get away with slightly damp hair, and I ended up rewrapping my hair in the morning. Even if you blow dry it first, you'll get better results from dry hair.