The commute was smooth this morning, but unfortunately nothing else really was. 48F and sunny with winds from the S @ 6mph. I always check my bike the night before to make sure everything is good, except last night. I came down this morning to a flat front tire. I replaced the bad tube with a new one and headed out to school. I almost didn't take the bike because of that, but decided to fix it. When i got to school, i was chaining my bike to the rack and heard a hissing sound. There was a piece of metal sticking out of the side wall of the rear tire. Before i head home i'll have to replace another tube. It's a good thing i have/had 2 spare tubes. I've gone about 1.5 months with commuting to school thru the streets of Springfield and about 3 months doing short trip around my town without a flat, then this occurs. The good thing is at least none of the flats happened during the commute out in traffic.