That question was posed to me while I was riding the subway after finishing a long day at work. I happened to be playing solitaire on my iphone (as usual during my afternoon commute home), one game after another without a break in between.
My answer to this person was “This keeps me from…” My voice trailed off because I realized she doesn’t know me, and so wouldn’t understand I was joking about solitaire keeping me from committing homicide. I answered a second time with “It keeps me calm.”
It’s a good question though, isn’t it?