I had my first flat today... Cruisin home, bike felt 'funny'. I checked the front tire and it felt a little lower than the back, but not flat. So I stopped to put some air in. I dunno if I tore it or if it was already torn, but the valve stem let go while I was pumping right where it meets the tube. Un-repairable... Luckily, I always carry a spare when i'm farther than walking distance from my apt. This was my first time changing a bike tube. It took about 15 minutes probably. Not bad for my first time.. heh, heh..
Other than that, the ride home was pretty nice.