Actually I do this all the time. I often forget to charge it or if I charge it leave it plugged in and accidently walk out of the house without it. I'm not a big phone person in general (prefer e-mail.) But mostly when I'm out and about I consider it my free time. As such I don't want to be tethered to the world - it's my time away so I don't want to be interrupted. Many friends think this is insane, but I rather like not being on call 24/7.