"Do'h!" of the day
I'm in my nicer clothes, don't have many tools with me, or a real jack, so I call AAA and wait an hour. Tow me over to a shop, where they check it and oh guess what it is the battery after all! Must have just had a bad connection on the jumper cable.
Embarrassing enough to get the car towed over a starter, but then to find it is just the battery....

Boy do I feel stupid right now....

BTW, my old battery I found was the original battery my car came with in 1998. 10 years, not bad for a car battery really.





