It was quite the ordeal.
I was able to visit a bike store during lunch and purchase a replacement inner-tube and pump - but was then unable to get the derailer (is that spelled correctly) back to its original position - so I then had to bum a ride HOME from the same coworker who gave me a ride to/from the gym.
It was an even BIGGER ordeal.
But in other news, I'm going to see the new Harry Potter movie tomorrow and I'm very excited.