The bike fell apart

So Matthias is my aunt's neighbor's son from back in Saarland, and he's living in Erlangen right now too. Tonight he invited me to come into town and hang out. Unfortunately, the next bus wasn't coming by until 10:30pm, so I decided to try and bike it. I brought my cousin's bike up to Erlangen with me, but I was only able to ride about 100 ft before the dérailleur (gear-shifting mechanism near the chain) just completely fell off, along with the chain. So I had to carry my bike back to the bed-and-breakfast where I'm staying, and I pretty much looked like a terrible bike thief.