The philosophy of "Pay It Forward" is that through acts of kindness among strangers, we all foster a more caring society. In the book and film, Reuben St. Clair, a social studies teacher in Atascadero, California, challenges his students to "change the world". One of his students, Trevor, takes the challenge to heart. He starts by showing kindness to a stranger which ripples further than he could have ever imagined. In October 2011, Life Vest Inside posted a video called "Kindness Boomerang".It shows how one act of kindness passes seamlessly from one person to the next and boomerangs back to the person who set it into motion. Orly Wahba, Life Vest Inside Founder and Director of Kindness Boomerang explains that each scene was based on real life experiences she personally went through; moments of kindness that left a lasting impression on her life. Within several months after its release, Kindness Boomerang went viral; reaching over 20 million people globally and eventually landing Wahba spot on the TED2013 stage to speak about the power of kindness. Singer-songwriter Harry Styles has been promoting kindness since at least 2017 with his slogan 'Treat People with Kindness', also abbreviated to 'TPWK'.