For me this random kindness behavior began after Donna died and got deeply involved in the grief community. I found that those who took a moment to recognize my struggle or just note a kind word about all I was going through gave me a lift. Made me feel less alone and broken. So much so that I began to do the same for them and expand that to others randomly. It works for me and will work for you. Try it out. Take a moment. Give a bit of kindness and see.