Got stranded...that's what I did today. Sort of. It was actually the other day, and I am once again glad that I keep a full tool set with me, because I got it fixed quickly. But this has happened before and I'm not too happy that it keeps happening.
Upon bumping the starter with the key in the ignition, the entire car goes dead instantly. Like everything, no interior lights, headlights, dash door-ajar lights - nothing. It'll stay dead until I disconnect the battery, let it sit for a bit, and then reconnect it. Then it'll start right up.
I posted about this sometime last year and based on feedback, I replaced the ignition switch which was already beginning to fail. So I don't think that's the issue now. For now, I'll keep carrying the tools, but it's not something I'd like to deal with if I am in a hurry.
If I was smart and it caught me at the right moment, I'd probably get the meter out and start probing. But of course it's very random and always catches me at inconvenient times.