So my children were all playing on electronics recently when I told them it was time to move on to other pursuits. My 4-year-old promptly logged off the computer while his older sister and brother tried to wrap up their games.
I happened to have a quarter in my pocket, so just for fun I gave it to my little guy as a spontaneous reward for being the first to do as I had asked. I do not usually reward my kids like that for simply doing what I ask. I expected him to be happy with the little gift.