Interesting problem last night. I left the car parked on the drive with the radio on whilst messing about in the front garden. I got distracted by my better half, which of course meant that when I got back to the car later the battrey was flat.
No problem, got the battery charger out and charged it up.
Drove the car into the garage, turned the ignition off, but the engine kept running....
The turbo timer's set to 0 (don't bother with it for work and back as there's plenty of time for cool down either end of the commute) but the engine's still running.
I ended up disconnecting the battery negative terminal to cut the engine.
Not a major issue, just strange:search: .