In many of my public talks, I tell the audience to identify two human beings in the room and just think, "I wish for this person to be happy"

That is it. I remind them to not do or say anything, just think - this is an entirely thinking exercise. The entire exercise is just 10 seconds' worth of thinking. 

Turns out that being on the giving end of a kind thought is rewarding in and of itself. 

- Chade-Meng Tan

Source: "Tools of Titan" by Tim Ferriss. Page 157.