I need a new craft hobby like I need another hole in my head.
That said, speaking as someone with five piercings in each ear and one in my nose, that clearly hasn't stopped me before.
Last September, I found myself looking ahead at a 3-day conference bookended by a train journey of roughly six hours involving multiple commuter trains (noteworthy for their complete lack of luggage space) at either end. I had just finished my last big commuting project, and all of my other unfinished projects were not terribly portable. I needed to find something compact and brainless but time-consuming, and I didn't have time to shop around for new tools or supplies. (Besides, the fabric/yarn embargo still stands.)
So it was that I picked up a bone needle and a ball of homespun wool, and took up yet another craft.