Uh Oh. Blew a tire.

I stayed late at work today and then tried to beat the darkness home. I lost because when I was crossing under Brooks Ave I noticed a roughness to my ride and then looked down to find my rear tire running low. I got off the bike and the tire was mocking me by hissing loudly. I was prepared to change it with levers, new tube and CO2, but it was dark and I called Erin to come and pick me up.