Dead battery caused electrical problem?

[JustinMorrison]

Hello,
Here's the story...for the past couple of days I've noticed that my battery is starting to go. When I start my car in the morning it has that slow feel to it. No problem, I'll replace it on the weekend, right? Well, today I started my car and drove it to the coffee place near my job and turned it off while I got my morning coffee. Five minutes later I went out to start the car and drive the one block from the cafe to work, but it wouldn't start. The battery, it seemed had met its maker. I walked to work and decided to get a jump from someone at work when I leave for the day. So a friend from work drove with me to my car and I decided to give it one more try...no luck though. He helped me push the car out of its parking spot so that we could use his car for a jump. At that point I tried one last time, and somehow my car started! Great, I'll drive home and get a new battery tomorrow! As soon as the idle dropped down to the normal level the "bulb out" light lit. I had not yet turned on my lights and if I remember correctly, the bulb out indicator only works on lights that are on at the time. I turned on my lights and inspected all of the exterior lights including the license plate lights and the turn signals, everything is on and looking good.

Boy, this one is too long! Sorry. Anyway, any ideas what might be the problem, or where to start looking? My car is a 1987 560SEL

Thanks!