I stood in the southbound carriageway of the A1 once watching an old MkIII Cortina burn whilst the brigade turned up to put it out. There wasn't much left of it by then. A middle aged couple on the way home from holiday said they'd already stopped at a garage because they were having electrical problems.....
I thought my Carlton was going the same way once, I was sat in the traffic on the way to work one morning when smoke started billowing out from behind the dashboard. Fortunately it stopped when I turned the ignition off. When I collected it from the garage they said they hadn't been able to find anything wrong, then when I drove off it started again 100 yards up the road. Turns out it was the heated rear window fuse melting the fuse box.