Driving is a good one. I still say that some of the most mentally productive years of my life were when I had a 45 minute each-way commute in a jeep with no CD

Driving is a good one. I still say that some of the most mentally productive years of my life were when I had a 45 minute each-way commute in a jeep with no CD player. The things I came up with during those drives were awesome :).